basically.
Bot hosters would ruin the game with spinbots and cheats, making the casula gamemode completely unplayable, after #SaveTF2 failed, we spent 4 long years in pain. "Casual is a Casualty". eventually, fed up, the TF2 and CS2 community (which was facing a similar issue) banded together to not only bully Valve (the creators of the games) into fixing it, but by also boycotting the lootboxes and other microtransactions in the games.
after 2 months, Valve finally banned over 80 THOUSAND BOTS. over 75% of BOTH GAMES playerbase. but it only took almost 9 years, dozens of innocent people being doxxed, hacked, and bullied to terrible results, and several prominent creators speaking on the issue for YEARS, did Vanve do something.
(the image is of the kinds of Sniper bots used)