Comment by choraria

Well, to clarify, this API is really for folks who're building platforms that require usernames. For ex: imagine if you were building the next Twitter or anything that requires usernames. There, you'd want to know what's happening with these kinds of usernames, where, people are now prepared to pay for too (premium usernames). Similarly, for cases where the names are offensive or profane, you may want to block outright.

As for definition of specific categories (more specifically public figures), you're right. Currently, it's just me building this and so I had to decide where to draw the line. I just drew it around the entire earth which I know is NOT the best appraoch but that's the one I went with just to ensure I cover all bases. Honestly, the API would tell if and why a username could be deemed reserved/premium. What to do with this info is really up to the platforms that are consuming it. They could let it slide, do nothing, just flag and monitor, block etc.