[Max_Mustermann]

I seriously doubt that, I've lived in 3 of the countries (fairly large ones) where WhatsApp is THE communications and in all of those, at least to my knowledge, most (mostly young) people send money electronically through banks, sometimes more modern digital versions like Nubank in Brazil, but there's no all-encompassing default solution.

[joeberon]

But in the US banking is very archaic and so bank transfers are not instant and I think even involve a fee unlike in most countries