You don't get to control that. It is Microsoft's right to do whatever it wants with GitHub - it could shut down tomorrow, or demand face ID. If you want to control what happens with a thing, you have to make the thing instead of letting someone else make the thing and sell it to Microsoft.
Your choice is to accept the product that exists on the market, switch to another product that exists on the market (such as Codeberg or self-hosted Forgejo), make your own product, or not use any.
You missed the option to "lobby the government to tell Microsoft to straighten up and fly right". Microsoft is a corporation, a legal entity only created with the permission and grace of the State of Washington.
Sure, I guess skywriting prayers to the spaghetti monster is also an option, but neither of those will do anything.