With the latest patch something happened, maybe the added a file or removed for some reason. the anit cheat problem was solved for me by this file: easyanticheat_x64.so. It is download able from here if you want to https://www.reddit.com/r/linux_gaming/comments/te2i42/apex_legends_eac_is_kicking_linux_users_out_of/ (not i uploaded it and the file is not mine). With this file the game is working prefectly fine.