As of now, this is getting ridiculous. They're just going to keep coming and spamming the forums with stuff, annoying the hell out of the community, and being douches in general. I highly doubt they're going to stop if their leaders are actually encouraging all of this for game-money.
Here's an idea to consider:
Maybe we could filter out anything ROBLOX from the forums, banning anyone who posts ROBLOX content for a period of time. This is exactly what they do in their community. It's a fairly efficient way to stop the spam.
Let's not forget that this act would, indeed, lower us to their level, and could possibly lead to further Fascist laws, but at this point and for the current situation, it's a just idea.
Then again, we could just as easily contact their admins and set up some kind of agreement or 'treaty' of sorts, to prevent them from spamming this site.
Until then, they'll just keep coming, and we'll just keep banning.
Remember, kids, read the threads after you fap.