Excluding, say, here or the fediverse more broadly.
There have been some nice corners of the internet that have somehow kept going along their way that I've enjoyed lurking around like some alien observer. They are the few spaces I dare not pop in and ask, out of fear it would somehow break things.
Shout-out to r/TESLore. I remember the exact moment I was hooked: Someone started her comment with the phrase: "We all know what the enatiomorph is, where it comes from, and how it's formed, but..." and I've gleefully been indulging with those other weirdos ever since.
Also, truestuhl.