I was going off of protondb. I can’t vouch for each game on the list’s exact state on any given day, only that according to everyone who ranks on the website it’s native or gold.

Apex Legends worked on Linux every year except this one. League I’m told dropped support only recently (in the last couple of years). Like, idk man, there’s ups and downs to this data, but the point is not all competitive multiplayer games don’t work on Linux and seemingly the majority do based on steam and protondb data.