Similar logic to how premium currencies in mobile games work.
The consumer version is already gone
If it's cheaper/more comfortable to use than other payment methods, users/influencers will use it. And why wouldn't it be more usable considering that they basically own the entire stack, including the attention of users on those platforms? One big hurdle could be the EU though..
IMO banks have sat back and let themselves be replaced. Bit of a bummer to have to be rescued from bad banking interfaces by big Fintech.
By that logic, Facebook wouldn't have any users right now, Instagram wouldn't be growing, WhatsApp shouldn't exist... should I go on? Facebooks digital grasp is enormous. That alone is why I think this will be a huge player.