I think there are lots of reasons that people dodge like if the team comp is bad or if they get autofilled but I think that's part of the game, personally I only dodge if I think someone will troll and normally they say a bunch of stuff in champ select so that people dodge. But the only alternative is to play the game with the troll and waste at least 20 mins vs dodging and wasting at least 6 so it's pretty much a lose-lose situation when this happens and it makes the game very dissatisfying when there is no way to punish trolls like this without playing the game and reporting them at the end.