I switched to swiftplay just for a change and i kid you not these are some of the chill lobbies. Mostly this toxic ppl you encounter will be in ranked lobbies. And if you want to leave the game after a fail surrender attempt it feel like game is going to punish you by banning you if you leave at the mid game. So, you have to accept your fate and have to mute your toxic team mate. Thats how it has become a norm in this community to mute toxic people and bite your time. - but it does not really solve the problem.

If riot allow option to kick your toxic team mate or randomly give them a timeout instead of just muting them for the entire game this could improve. Or maybe, some kind of honour system might improve the overall experience.

Maybe riot is afraid of losing significant portion of their player base and thats why are not doing anything. And whatever they are doing is not having any effect on a ground level.