For beehaw its because beehaw defederated sh.itjust.works first, so having beehaw comments show up is just too confusing since sh.itjust.works could see beehaw comments, but not the other way around, and since beehaw could never see the replies from sh.itjust.works users anyways, so they also defederated to make it less confusing.
beehaw, lemmygrad, hexbear.
sure there’s more but there’s not a way to see why they are defederated
https://sh.itjust.works/instances
https://gui.fediseer.com/ can help
For beehaw its because beehaw defederated sh.itjust.works first, so having beehaw comments show up is just too confusing since sh.itjust.works could see beehaw comments, but not the other way around, and since beehaw could never see the replies from sh.itjust.works users anyways, so they also defederated to make it less confusing.