This is not a hypothetical problem and you don't need to be deliberately targeted. It actually happens to normal people. And if it does you have absolutely zero recourse.

Source: I have a banned Google account (it's over 20 years old at this point). I know the password, but Google doesn't let me log into it. Every few years I try to unsuccessfully recover it.

If you have a Google account and having it banned would be a problem for you here's my advice: migrate. Right now. You never know when one of their bots will deem you a persona non grata.