My adc afk, and after the match I received an agreement from riot asked me to "not leave game in th"

This is totally ridiculous. My adc afk, so that the tower was gone within 5 min. I actually got the first blood by hook their support from the drag pond. The jg tried to gank and I trusted him, the result is both of us got killed. I went to the mid, found the player was new to the trial champion and I couldn't help much. So later in the game all I wanted to do was to go around in the base. I was clicking the mouse and wasting 10 more minutes and my team voted. And the result is I get warned and is asked to sign the agreement to not "leave a game in the future".

Riot, its not ppl don't want to play support. Tell me, would players in other lanes suffer this kind of shit? And get reported bc another ppl's problem?

You'd better fix it. Its not about sportsmanship at all. I carried my noob team yesterday when all the 3 crystals were down and won the match. That's called sportsmanship. I did 28/2 as adc in ranked game and saved the world, that's called sportsmanship. Reported due to my partner's dc? I cannot accept it.

You'd better fix it.