You are assuming anyone would of translated the game in the first place. It is easy to think that way after the fact, but sometimes a game was never going to get a non MTL translation. That being said only fan translators care if a game has an MTL, publishers, localizers, and just any company that puts out games like this generally don't.
I would say what really would kill a translation is when the circle puts out a MTL and sells it on DLsite. Maybe focus your efforts on scolding them, then fan translations like this aren't going to stop no matter how much people like yourself hate MTL and rally against it.
Like others have said if you hate it do better make a translation yourself and be the hero. Shit part of the reason I started translating is because I thought I could do it better eventually. Hopefully I can reach the point where that's true one day. If my dumbass can do it, anyone can.