I've seen comments to the effect that Calckey is the Fediverse Tumblr.

tumblr users are currently extremely upset at recently announced planned updates. most notably, collapsing long multi-user reblogs into a simple root post facebook style. some of those posts are collaboration years in the making with incremental contributions from tens of users, or meme chains 50 memes deep and are part of basic culture of tumblr. And notably not something seen elsewhere outside of rare reddit comment chains, whereas it is the basic form of tumblr interaction. posts that go around carry contributions from multiple users like this with some of them being multiple versions of different contributions. or one single user's chain of reblogs

Most of the best tumblrs are just one person post image after image with an occasional blogpost.

single image posts made up most blogs just like 10 upvotes posts and comments littered reddit, but the backbone of the true culture of the site is not made of them.

words of recreating tumblr if that is lost is already floating around - mostly as a backlash, nothing serious yet, but that it was said is in itself is telling.>>

Also, trying to find the links that wouldn't freeze into a forced login (by having a recent new users in the chain - their default setting) is a terrible hassle, and tumblr users are also deeply annoyed at that and also because you can't share links without vivisecting each and every link out of tumbr (i edited each of those links above into the older tumblr link format. like changing every url from reddit to old.reddit.com, but tumblr) makes sharing links out of tumblr very painful these days.

edit: removing reblog chains is making people angry on the site.

or as the cookie clicker guy puts it

reblog chains where users iteratively produce something funny or informative are practically this site’s main cultural export i don’t know what kind of tepid soup is sloshing around in your skull that you’d even consider getting rid of that

edit2: welp let's tumblr blackout that didn't happen but it is a more comprehensive list of grievances

--please message if i miss a locked post and any of the links is actually broken

Honestly, the difference between Tumblr and a Lemmy community is somewhat fleeting. Most of the best tumblrs are just one person post image after image with an occasional blogpost.

If lemmy got some more window dressings and maybe a vertical layout and boosts, you'd have a tumblr clone.