Just going over the various recent posts, most of them are from brand new accounts that then get deleted. Many of them are from people saying they’re from foreign countries yet the OP speaks perfect English. In one case I mentioned that the username was the same as a Reddit/Instagram user…
Limiting post creation to older accounts might help, otherwise verification by mods…
Some people need to hide their identity and post on a throwaway, though. This would mean those people won’t post anymore, and they can be genuine.
Hence the verification by mods option (which they do on Reddit for the most surprising AMAs)