in eu we're talking about people coding bots to flood casual and make it unplayable, I imagine it's not even that much of a time waster for them once the bots are functional. Idk if they feel important knowing valve won't stop them so they can effectively grief thousands of people at the same time, or if they developed a hate for the game and want to run it to the ground.
Either way I'm pretty convinced this is a bigger threat to the future of tf2 than anything that happens in the comp community. Pubs are the heart of the game.