You are making the mistake of assuming that people make a decision about what institution to bank with solely based on what kind of 2FA they provide. In reality, there are many other factors involved. I ended up banking with these institutions for a reason. And I don’t know what the overall situation outside the US, e.g. in Europe, is but I think in the US there are few banks that offer something better than SMS 2FA. Some will force you or invite you to use their special app (which may or may not only work with SafetyNet) instead, which is absolutely not an improvement except perhaps strictly in the security sense. I think there are a few experimenting with FIDO2 hardware security keys but that is the exception. This is a problem that requires regulation not telling random individuals that they just need to git gud at picking a bank.

Outside the US and maybe Japan, iMessage isn’t even a realistic alternative to any other messaging platform or SMS.

My credit union uses SMS for 2FA, so does my (online) bank. What “host of other options are available”? Do tell. But GTFO if you are going to suggest paying my health insurance premium or rural grocery store in Monero or some nonsense like that.