Is it? I’ve never touched Facebook api, but it sounds ridiculous that you need to provide tax details for DEVELOPMENT. Can’t they implement some kind of a sandbox with dummy data?
Before you can sign up to build a WhatsApp bot, you need to jump through a million hoops, and after that, every automated message template must be vetted by Meta before it can be sent out, apple style.
I'm glad of this, because unlike SMS and other messaging platforms, WhatsApp is spam free and a pleasure to use.
At least here in Italy whatsapp is a spam house unless you actively update the default privacy settings in-app. There is no discernable difference between SMS and WhatsApp to spammers.