I don't think it warrants its own thread, but the competitive TF2 scene has also had some interesting moments, like:
1. A few top-level players, Nursey and broKing, were banned from the game's leagues after grooming allegations against them
were made public roughly four years ago. Nursey continues to complain about this
to this day.
2. ThatGuyTagg, a high-level player and gay, black furry,
had a public meltdown on stream and ragequit the scene because his friends jokingly called him the N word.
3. Lange, a former player, caster responsible for arguably TF2's
most well-known competitive highlight, creator of the Tip of The Hats charity streams, and creator of TF2's training server mod called MGE, suffered some kind of schizophrenic breakdown years ago
that appears to still be going on.
4. A player named TLR
stole a plastic LAN competition trophy from the winners' hotel room.
5. Top player
b4nny was invited to Valve headquarters to assist them in creating an
in-game competitive mode, which turned into a massive pile of trash that nobody plays.
6. Ex-TF2 player turned now-ex-pro Overwatch player clockwork stole b4nny's girlfriend while the two were on the same team, and b4nny was so invested in winning that he refused to cut the man that literally cucked him in front of everyone.
7. After
VAC finally picked up on LMAObox, a pack of cheats that had been undetected for close to a decade, players from every single winning highlander team over the previous three years had been immediately VAC banned.
8. Valve's foray into working with the community on an official update predictably
turned into a shitshow.
9. Ex-TF2 player turned current(?) pro Overwatch streamer/player Harbleu was(?) an unironic Pokemon furry whose Steam chat pokemon e-rp logs were leaked in pastebins, and his trans "girlfriend" m4risa posted video of them masturbating on the porn site "motherless" for a bunch of teenagers to see. This is highly esoteric lore, but there are people that will back this up.
These are just off the top of my head. It's an insular and niche community full of literal autists and children; it reminds me of the Blockland forums.