WhatsApp business api is in a weird situation.
the poor countries use WhatsApp mostly due the fact that sms was costly.
so you're tryna to monetize against businesses serving poorer users. yes - they maybe more in number but margins are razor thin.
the richer countries where margins are higher - sms, email, etc are cheaper & permission less. so eventually most providers most settling on email & sms/rcs.
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It's weird how hard it is to get programmatic access to a mobile-first messaging service. Telegram is the only one that makes it easy. WhatsApp and iMessage have first party solutions that assume you're a business with 1:M comms. Signal doesn't want bot users at all.
Maybe I need to start looking at SMS/MMS proper, but that's putting a lot of information in the clear and giving up a lot of features.