Nostr is actually protocol neutral. Anyone can use it freely whatever backgrounds they have. If you looking on global feed, then you can find various people from Bitcoiner (more than 90% probably), ETH User, XMR User, Fediverse User (via Bridge), Chinese, Japanese, Spanish, Arabs, various Nationality, and many more. We just need time for more various users diversity :)

If you are looking for some topic then https://nostr.band search feature maybe can help you