I think Tumblr is still a great platform for fan communities, especially for sharing edits, discussing characters, and discussing fan theories. However, some users have moved to other platforms because it's easier to connect with people and share memes there. Tumblr's distinct community still exists, but the truth is that most active fandom communities have now fragmented, with most of the conversation now happening on TikTok, Reddit, etc. But there's less noise now and the community is more genuine and older, so if you want to talk about your favorite shows in a relaxed environment, it's still great, and it depends on what kind of fans are there.