I don’t see a major issue with this, if it’s implemented right. As it stands, only site admins have full control of lemmy instances - and we don’t really get too invested in how communities moderate. So it would really just be up for community mods to edit titles as they see fit. If the post had a little “edited by moderator” flag next to the title, and perhaps a way to see what was editted, a lot of the concerns about misuse would be negated. This is also the kind of thing we’d add to the modlog, where we keep moderation transparent.

Then, of course, communities who are known to abuse the function could just be avoided by the broader lemmy community. Anyone can start their own instances if it seems like others are being filled with misuse, as well anyone can create a replacement community for ones that are being misused too.

And no, Lemmy isn’t open for far-right instances, read the site rules on the ‘Join Lemmy’ page. (saying that here, because someone misunderstood in the comments on this post).