Banks don’t do this because of profit. They do it because of decades of laws pushing in this direction. Anti-money laundering, know your customer, digitalised currency, abandoning cash, preventing tax evasion etc… it’s been getting more extensive over time.

> vote with your wallet

This does not work. You aren't talking about pissing off a significant percentage of the users who go elsewhere.

The imbalance in power is unthinkable to people 100 years ago when the phrase was first popularised.

> Let them know. Write a letter to the CEO.

I think you're naively presuming the issue is simple and easy to address with a letter.

Regardless of your bank, payment systems such as Visa and Mastercard have blocked transactions involving mainstream online stores such as Steam because they unilaterally deemed some games to be problematic. You cannot fix this problem with an email.

Do you think banks are using attestation gratuitously? It helps prevent a lot of fraud. You are opposing something that saves people’s savings every day just because you think it takes “freedom” away from a few hobbyists. Do you even have a phone that does not support hardware attestation or is all this posturing about something hypothetical?