Recently there was a thing where VAC would erroneously flag AMD’s antilag+ feature as cheating, and issue a ban.
AMD then quickly disabled the feature by default but now Valve also patched detection for it and is now, at least according to these patch notes, reversing the bans.
Happened to me with World of Warcraft. Went on vacation and I was banned when I got back. Put a lot of money into that. Logged in a few years ago and all of account stuff was deleted. Gotta love when you’re erroneously targeted.
All I was doing was going to a vender in the wild and buying thread for some silver and then selling for gold on the auction because high level players were lazy and didn’t want to go find it. I was low level and had a ton of gold. It was fun. But unfortunately there are people that follow that pattern and are breaking rules. I matched it and got banned.
Another tale from the epic of Blizzard is a Shitty Company.