Netflix could have their access to video content cut off if they don't comply with all the ridiculous power trips of content "rights" owners. Banks only have to comply with actual laws.
Phone numbers are irrelevant for that though, so the only reason banks would think they need it is a false correlation between phone numbers and identities.
Netflix also seems to think phone numbers have something to do with identities. But you'd expect banks to be more serious about verification.
Also, glad to hear that identity theft has stopped existing, it's about time. Hmm, why are identity fraud alerts still a thing? I'm sure they just haven't gotten around to removing it yet.