Do we know any more about the plans of Tumblr for when it will join the Fediverse?
Matt did say "ASAP" at the time. Start of July saying they're still working on it, did he simply underestimate how big of an undertaking it would be?
Once you look into it, you realize the interoperability isn't there like some claim. "Joining the fediverse" as a single instance means nothing. Activitypub doesn't make everything instantly interoperable, and being able to crosspost on everything is a large (and pretty futile) undertaking.
Two services that are very interoperable (because kbin is designed to be, specifically able to bring in microblogging content while lemmy can't) and still have problems. Did you know boosts are what make comments appear higher on kbin while favorites work that way on Lemmy? That's the sort of thing I'm taking about. Every implimentation of activitypub kind of makes its own rules on what tokens mean and if you want to be compatible, you have to change your service as they change theirs (which is what happened, lemmy changed and kbin hasn't gotten around to it yet since it's not a big priority).