FB only wanted whatsapp to preempt a potential competitor. They are happy to give the service for free (at a loss)
There is no room for monetization because of FB. In other words, you can't compete with a monopoly, even if you are in a different business. They simply take all
>>collab+(OP)
FB is getting and using some metadata from WhatsApp. FB also said it would be introducing ads in WhatsApp. While WhatsApp may not be raking in a lot of money, it’s not a complete loss for Meta either.