WhatsApp isn't just a chat app anymore. With 3 billion users as of March 2025 and 284 million active business accounts in 2026, it's become a full-blown marketing and customer service channel (Chatarmin, 2026). Open rates hover between 95-98%, and users respond within 45-90 seconds on average. Compare that to email's 20-25% open rate and 6+ hour response time, and you start to see why businesses are taking WhatsApp seriously.