is it wrong to duo/trio with people.

if I don't have any communication with them outside the game chat. I usually add people that I see that don't give up and do their best in a game and duo trio with them. I don't like to play with an ad carry that says gg and starts walking into skillshots after 2 deaths. and simply reduce the chances of getting matched with a feeder. I never use voice chat or any sort of communication outside the game chat and I don't know these people. same elo as me. give or take 100 MMR under or above. i understand that something like skype is an unfair advantage because there is no built in game chat in the game. which i dont use them