Yeah that’s what Lemmy started out as. The thing is with all the Reddit refugees flooding in it is diluting out the tankies. Besides, lemmygrad.ml is blocked by many instances. As for the values of the devs the great thing is that Lemmy is FOSS so if they go rouge someone will just make a fork of Lemmy.
The political views of the main devs are controversial but it doesn’t really matter since Lemmy is free and open source. No one owns or runs it. Only lemmy.ml specifically is run by the devs.