WhatsApp doesn't rely on ads for their income and never has. For one the technology may have helped the company save development cost for their other chat appli

WhatsApp doesn't rely on ads for their income and never has. For one the technology may have helped the company save development cost for their other chat applications (Facebook messenger & Instagram). On the other hand WhatsApp Business is probably pretty profitable, although there are sadly no public revenue reports I could find. Additionally I assume the running costs for WhatsApp are probably not very high.