Something to remember is that back in 2018 there mightve been a different vision around WhatsApp businesses possibly helping subsidizing the app for things that are useful for their customers.
From a 2018 interview of Brian Acton after he left Facebook ( https://www.forbes.com/sites/parmyolson/2018/09/26/exclusive... ):
" "An SMS has just come in from his local Honda dealer saying “payment received.” He points to it on his phone.
“This is what I wanted people to do with WhatsApp,” he says of the world’s biggest messaging service, "