Yes! Any developer that forces the user to use a specific type of device needs to be smacked around a bit (or more accurately, the manager that told them to do

Yes! Any developer that forces the user to use a specific type of device needs to be smacked around a bit (or more accurately, the manager that told them to do it that way). Banks are notorious for this, since their stupid 2FA apps will do insane things like scan your app list for common root-only apps and non-vendor ROMs (even with no root). Some even have a vendor whitelist that obscure brands (like OnePlus used to be) aren't on and in both cases, their only response is "well just factory reset your phone" or "just buy a different device". I've switched banks twice because of this insanity. And there's no reason to do this! It's not like they're liable if I get my money stolen. If they prove 2FA was used and the security issue was on my device, not their app/server, it's my fault! As you said, if you're a custodian of something sensitive (an account, documents, money..), not the owner of it, it makes sense that the owner shouldd be able to dictate how you should protect it (like if you're accessing confidential company documents using 2FA). But in any other case, the service provider should never be allowed to force you to use a certain type of authentication device.