If I had to guess, maybe people who aren’t interested in the furry fandom itself and only like the porn they make? I would imagine virtually anyone even a little into the subculture would have already heard of that site even if just from memes that use it as a punchline.

Not Texans. Not anymore.

E621 only allows artwork, not “real” porn. If you want to post or watch a video of actual people in fursuits fucking, there’s surprisingly few places to do it especially after the purge of more amateur friendly sites like XTube.