Ooof, this was pretty depressing to read. It seems like your options are:
1. Ignore the letter: not recommended, as that will likely end in a lawsuit that you'll probably lose.
2. Comply: maybe not with everything (like if they ask you to do ridiculous things like give them a look at your finances), but at least stop doing what you're doing that triggered the whole thing in the first place.
3. Engage a lawyer and fight: but you're probably going to lose, unless you're independently wealthy, and/or can rally some legal-aid services that specialize in digital rights, as well as journalists and other powerful entities to help you.
And in all cases, if it's an entity like Meta, they've likely already disabled your existing accounts and banned you, and you'll never get them back.
1. Ignore the letter: not recommended, as that will likely end in a lawsuit that you'll probably lose.
2. Comply: maybe not with everything (like if they ask you to do ridiculous things like give them a look at your finances), but at least stop doing what you're doing that triggered the whole thing in the first place.
3. Engage a lawyer and fight: but you're probably going to lose, unless you're independently wealthy, and/or can rally some legal-aid services that specialize in digital rights, as well as journalists and other powerful entities to help you.
And in all cases, if it's an entity like Meta, they've likely already disabled your existing accounts and banned you, and you'll never get them back.