Someone admitted in post-game lobby to playing on his friends account to get it to high plat/low diamond (this was a mid silver game) for the purpose to boost a friend's account so they can play together in ranked.
Is this not reportable? I have screenshots of the conversation and took a few more for posterity
Hotarµ5 votesYou can file a support ticket (found right here) and provide those screenshots in addition to a detailed description of the situation. Riot won't disclose the outcome of the matter but if it's as black and white as you say, I can't imagine they wouldn't be punished for it.
Jennifer4201 voteshehe xD the jokes again
Torcida1 votesThank you for the fast response :)
MordridtheBlack2 votesespecially given it is in the ToS that account sharing is a no-no
IFeltLikeAGringo1 votesDefinitely reportable.