Goblin - run by a former Wordpress and Tumblr developer! It's code disallows popular AI training models to use your images to train off of, and is connected to the Fediverse!
Wafrn - has a very active dev that's adding new features often! It is open-source, and doesn't use cookies or third-party analytics tools.
Neocities - okay, maybe not a tumblr-alike, but if you love CSS crimes, you'll love Neocities! Making your own site can be scary, but there are loads of templates and guides on how to get started! Check out Nomnomnami's guide on how to get started.
