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.
I think you have to be logged in in Redlauncher to get some extra stuff (missions, cosmetics, etc.). Also some Twitch exclusive stuff.