Tribunal looks for patterns of frequent / consistent toxicity. If others were not banned it is either they are not toxic often enough or are coming up on a tribunal case/ban. It could also mean that their reports were sent to tribunal and pardoned. Regardless of what happens to others in that game, only you are responsible for your behavoir in the game.
That said ill check out the game.
You are insulting to multiple teammates. It isnt just calling them bad you call them stupid, dumb, and trolls. Alone, even together, they are not that bad but that is hardly an excuse for it. You mention another account that has been perma-banned so clearly you have been through the system before. There are lots of codes and explinations out there, threads you can go through for more insight, and the infamous just "don't be a jerk" quote. I think that you understand that you can't, regardless of how true it may be or how upset you might be by what someone is doing, flame/insult them. You know this is against the spirit and code of the game but do it anyway and than whine when you are found guilty for it.
At the very most trying being constructive with your criticism. Instead of starting out with "do we have a jungler?" when you know damn well that you do. Try saying "jungler we could use some ganks" or they got people camping us we coudl sure use you down here". Later instead of something like "I love how this dumb jungler always comes when we're not there." Try giving the guuy more direction like "they are over extended now is a good time to come gank" or " we got this spell ready lets plan this..." You do not even try to positively interact with your teammates.
Noone says you need to be a care bear but you take less than ideal situations and make them worst by insulting your teammates, refusing to help them or go along with their plans b.c they didnt follow yours and then spam all chat with QQ. You were even asking for surrender votes b/c you felt the game was so hopeless and instead of making the best of it when it failed you insult your team more.
Luckily they were not so demoralized by you and janna that you all still pulled off a win but seriously..after all that can you really say it was worth it? And do you think your behavoir did anything to help the situation or make the game enjoyable? Myself, and I suppose a majority of voters, think no.
Again, this is far from the worst out there but that doesnt mean you are quite there yet. If you honestly cant think of any better way to phrase things or get your wishes across to your teammates than you might be one of those who are better of not typing in game at all. Stick to the basic MIA calls and warning/target pings. Continueing down the path you took with your first account is just going to end in this new account being perma-banned as well.