AFAIK there was another exodus after they announced to be training AI based on Reddit content, another when they went public, another for starting heavily censoring more the platform (some people a while ago were getting banned just for saying Luigi or upvoting posts with it)
PieFed has wikis and flairs for communities, Feed feature similar to how people can create their own custom feeds on Bluesky and Topics feature to browse content by subject, you can filter posts by keywords (Lemmy has it too but not on the default interface), warning label by the side of the name of people with too many negative karma/points/reputation to make it easier to spot trolls and some other fun things if you ever want to try it out although theres no mobile app for iOS afaik yet if thats a dealbreaker for you, but theres for android https://codeberg.org/freamon/pferd/
PieFed becoming a lot more akin to an evolved Reddit than Lemmy lately with the recent updates