I think one of the main mods was banned from the instance for having multiple accounts. Personally I don't see that as a problem unless it is used problematically.
And the .ml instance was a bit too tankie at times.
Oh wow, I did not know that had happened. Totally makes sense to move, just had a feeling something had triggered the decision. Lemmy.ca seems to have a more active Plex community but it's always good to have a backup.