What if I want to vote against both Apple and Google but still be able to do my banking business?
You can bank without Apple iOS/macOS or Google Android/Chrome.
You can also vote with your wallet regarding banking. Put your deposits in another bank.
Select your bank(s) accordingly.
When one party has a trillion votes and you have like 1000 or so, that is not voting. That is just exiling yourself.
Edit: exiling not exhaling
Use a laptop
Why should your bank trust you?
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What banking business? Use a web browser, or just bank in person like everyone did not long ago. Carry a credit card instead of Apple/Google Pay. That's what degoogled Android users do and it's a very minor inconvenience anyone with a little bit of maturity should be able to accept. Also, cash is much better for your privacy.