Not necessarily political in ideology, but the tool included a fairly cruddy hardcoded slur regex that instance admins couldn't configure. It was prone to picking up false flags (someone tried for example to make a Stardew Valley community on it but it got censored out by the slur filter).

The stated reason for not removing it or making it configurable was "to make it as difficult as possible for far right instances to use Lemmy", but all it really seems to have resulted in is a dozen or so forks dedicated to removing the slur filter and at least one missed customer who doesn't like dealing with "computer says no" nonsense (by which I mean me, I always like trying out fedi tools).

It eventually did get configurable if memory serves me right, but that took several years. I'm sure there's more, these sorts of ideology driven projects always end up with similarly crappy anti-features.