One of Trace's players, heybay, was banned by Riot for matchfixing in Valorant back in 2021 for a year before returning back to the pro scene. Don't think there's ever been a pro player that's done that and then qualified to Champions. Interesting storyline or nah?
Source: https://valo2asia.com/riot-games-issues-bans-to-13-chinese-players-in-valorant-match-fixing-scandal/