Just saw the Ars Technica article on this, and it included this lovely section:

As detailed in the r/macgaming subreddit and at r/SteamDeck, many players who successfully got Marvel Rivals working would receive a “Penalty Issued” notice, with a violation “detected” and bans issued until 2124. Should such a ban stand, players risked entirely missing the much- prophesied Year of the Linux Desktop or Mainstream Mac Gaming, almost certain to happen at some point in that span.