First reported by IGN, it appears that Marvel Rivals' season one update has disabled mods in the game. Until now, there was actually a surprisingly lively scene of modders creating skins and other cosmetic additions for the NetEase hero shooter.
Users in the Marvel Rivals Discord have said that the update has introduced asset hash checking to prevent client-side modification of the game's files. There was no mention of this change in the season one patch notes, but that's probably because...