i know league in seasons 2018-2019 was worse cause the meta at the time every single player hated you could also gain more MMR by throwing games than you could losing them straight up due to the report system failing at the time cause as long as one person quit you and your team was guarentee’d to only lose half the normal amount of MMR wheras the quitter lost the normal amount so you were encouraged if you were losing to start fucking over your teamates to get them to quit
this would even fuck over the enemy team by getting them to gain less MMR cause someone on the opposite team quit
the only thing the quitter had to deal with was 2hours of not being able to que and if he quits too many times in a row 48 hour ban
now i know at the end of 2019 Riot revamped their report system to get rid of this problem but it WAS HELL AT THE TIME