That's missing the point. Deleting your FB account doesn't affect FB's power or practices. Does it make you slightly less directly affected by their nonsense? Sure, but it's often a false sense of security. If disinformation on FB results in a different outcome to your election, or prevents parents from thinking a COVID vaccine is safe, or whatever else, that affects your life even if you're not on the platform.

You have a say in your government's leadership. Don't like the President? Vote them out. Don't like Zuck? Nothing you can do about it.