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You Are Using WhatsApp Like Email. Your Customers Have Noticed.
- Interactive Rewards
- 1 day ago
- 4 min read
By Shawn Tan, Interactive Rewards Asia
Published 7th August 2026
WhatsApp delivers open rates that email cannot match. But treating it as another broadcast channel is quietly destroying the trust that made it valuable in the first place.
In 2023, a senior marketer at a major regional bank looked at their WhatsApp Business open rates — 60%, 70%, sometimes higher — and made a decision that seemed obvious: move all promotions there. The reason was simple. Email was getting only 18% open rates. SMS was expensive and hard to track. WhatsApp was where customers were spending their time.
Two years later, that same channel is showing a sharp increase in customers opting out after every campaign. Customer service agents are receiving "why do you keep messaging me?" complaints. And the marketing team cannot understand why a channel with such high open rates is producing such poor conversion results.
This is the WhatsApp broadcast problem, and it has affected many well-established brands across Southeast Asia in the past 18 months.
Why this moment is different
Adoption of the WhatsApp Business API — the tool businesses use to send messages at scale — grew rapidly across the Asia Pacific region through 2024 and into 2025. Telcos, banks, airlines, and retailers in Malaysia, Indonesia, and Singapore all invested in messaging infrastructure. Meta made it easier for businesses to access the platform commercially, and consumer behaviour since the pandemic had made WhatsApp the primary digital channel across much of the region. In Indonesia, WhatsApp is used by more than 90% of internet users. In Malaysia, it is the default channel for everything from family group chats to business invoices. In Singapore, WhatsApp is the primary channel for both personal and professional communication, and businesses use it for customer service, appointment reminders, and payment notifications.
Most teams simply moved their old SMS and email marketing plans into WhatsApp — and called it a conversational strategy.
The customer response has been predictable. When businesses send too many unsolicited promotional messages, customers start blocking and opting out. A channel that once felt personal and useful is being damaged by overuse.
Where Teams Get It Wrong
The most common mistake is not technical. It is about how businesses think about the channel. Three problems are appearing across regional brands right now.
Using WhatsApp only as a delivery tool. The reasoning is: "Our customers are on WhatsApp. We need to reach them. So we use WhatsApp." But WhatsApp's high open rates exist because people use it to communicate with friends and family, not because they are waiting for brand promotions. Brands are using trust that already exists on the platform. They are not earning their own.
Treating opt-in as permission to send anything, at any volume. A customer who subscribes during a loyalty program sign-up has not agreed to receive your monthly promotions, partner announcements, and new product updates all within the same two-week period. A broad opt-in gives legal permission to contact a customer. It does not give permission to send messages as frequently as you choose.
Separating promotions from customer service. Brands that use WhatsApp to send promotions but direct service questions to a separate chatbot or hotline create a confusing experience. A customer replies to a promotional message and receives no response. That single failed interaction does not just disappoint. It damages the customer's trust in the channel permanently.
What to Do Instead
01 — Send messages based on customer behaviour, not your marketing schedule
Trigger messages from what a customer has actually done, not from your campaign calendar. A message sent when a loyalty member is 200 points away from their next tier reward is far more relevant than a generic "double points this weekend" message sent to everyone. A Singapore-based super app's reward reminders — triggered by points expiry dates and proximity to the next reward — consistently perform better than campaign-style broadcasts because they are tied to each customer's actual situation.
02 — Design every message so customers can reply
If your WhatsApp message has no way for the customer to respond, you are sending an announcement, not starting a conversation. A leading Malaysian bank does this well: customers receive a transaction alert and can immediately flag a dispute or confirm a purchase from the same chat thread. The message is designed to receive a reply and is ready to handle it. That is what makes it feel like a service interaction, not an advertisement.
03 — Use WhatsApp for existing customers, not new ones
Do not use WhatsApp to reach people who have never purchased from you before. Sending unsolicited messages to new contacts, or running referral campaigns aimed at people with no existing relationship with your brand, damages channel trust and delivers poor results. If a customer has not yet made a purchase with you, WhatsApp is usually the wrong first point of contact. Use it to strengthen relationships that already exist.
04 — Set message frequency limits before customers set them for you
A simple rule — no customer receives more than four promotional WhatsApp messages per month, with any service message resetting that count — will protect the channel more effectively than any automated optimisation tool. A regional airline has tested a system where the number of messages sent to each member is adjusted based on how engaged that member is. Members who engage less receive fewer messages; members who engage more receive more. Engagement rates improved and opt-outs fell.
The Outcome
When WhatsApp messaging is triggered by real customer behaviour, designed for two-way conversation, and managed with clear limits on frequency, it stops functioning as a marketing channel and starts functioning as a service channel that occasionally generates revenue — which is the right way to use it. Brands that have made this change report opt-out rates 30 to 50% lower than those using a broadcast-heavy approach. They also show improvement in customer satisfaction scores (NPS, or Net Promoter Score) on service interactions, and, perhaps unexpectedly, higher conversion rates per message even though the total number of messages sent is lower. This is not a minor improvement. It is a measurable driver of customer retention and long-term customer value (LTV, or Lifetime Value).
The high open rate on your WhatsApp channel is not a sign that customers want more messages. It is proof that they are still paying attention. Do not use that attention on promotional campaigns. Use it at the moments when customers are ready to make a decision.
This is an article published by Interactive Rewards.