Here they come.... brace yourselves. Tyler1 is free to stream OTHER games. It's not his Twitch account that has been given the lifetime ban. He's made.....what is it? Over 20 permanently banned mistakes? If he wants to yell at his teammates he should've done it at his screen rather than in chat. Insta-locking teemo when there's someone on the team that pisses you off, having an "int" list, and behaving like he did is NOT okay. Players get perma-banned for doing what he did. He got the lifetime because of his extreme case of repeat offending.
I will, however, end on a positive note regarding Tyler1. He didn't take the forum post horrendously (well, at least not in public anyway that we know of). He told his stream he would miss them. He didn't try to defend his actions and he knows what he's done. He took it gracefully and THAT's something that the rest of the perma banned players who cry and weh on the forums can take a lesson from. You know what you did, accepting the punishment gracefully without further intent to flame riot on the forums is the way to go. He may be allowed back one day, I mean they let Jensen back. Moreover, it's not like Tyler1 was XJ9 status or anything.
But for now it will stick in place. When you're that toxic with no reform, Riot brings out the big guns.
This whole comment is ignoring the account sharing/purchasing thing as well. I will focus on his toxicity rather than anything else.