Petitions don't actually accomplish anything. When dealing with government entities formalized complaints SOMETIMES do, but even that is an extreme longshot (Stop Killing Games for example got EXTREMELY lucky, and they may still get nowhere in the end). But GGG is not a government entity.
What does work, to some degree, is direct communication on whatever platform they're actually paying attention to. There has been a LOT of that on the new, crappy forum, and they have responded to some degree: supposedly they're looking into archival possibilities at the very least. But we'll see.