@ryuuji
Use a separate computer for League. Install Chrome, League, and literally nothing else. I'm not even sure Adrenaline/GeForce Experience or even Discord is safe.
Install Chrome (not chromium) *but do not use it*. The only reason it's being installed is because an anticheat staffer said they find Edge being the default browser to be suspicious.
Do not spend any more money on Riot's games, because each game is very likely to be your last, and you will be told it's your fault.