[Ekaros]

There are so many groups and most of them don't regularly pop up in mainstream culture.

The fact that mainstream has co-opted many of the past nerdy things doesn't mean they are gone. They have just moved to new not so visible things. And those are hard to see in sea of all the content produced. Independent podcast and comics are a thing. And then there is novels and such from China, Korea and Japan. Some of these more mainstream already lot less.