I am asian but I never use that to describe myself. There's always a narrower adjective that doesn't lump culturally distinct groups like chinese/korean/japanese/etc together.
Except when I am describing how I look.
So I don't see this a bad thing. I basically expect the same results when you search for other descriptor of appearances like blonde or big boobs. There's no other reason for subreddit communities to form around appearances other than look at gifs of them. (though there are exceptions like when you want to form communities specifically to complain about problems caused by said appearances: /r/bigboobproblems /r/ABraThatFits)
The issue is that china and korea banned porn so you have no other choice if want a pornstar who looks east asian. I'm ethnically chinese and I've been jerking it to japanese porn on mute for decades now.