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While some banking apps do this, I wouldn't call it common. I have ~10 bank/brokerage apps on my GrapheneOS device and they all work just fine.

Workaround for me is to change bank then. Would love getting away from iOS spying on me.

Don't use a bank that demands an app instead of having a website?

I haven't used Linux on a phone yet so I don't know about those, but regular rooted android has easy ways to circumvent what you're talking about.

Generally, in order to run bank apps on a non-stock ROM you have to root your phone and install things that hide it, kinda defeating the purpose.