Hard to say without doxing Nostr and Bitcoin core devs.

I pay attention to the internationalization of Bitcoin development because I grew up in the global south and worked w many startup founders and VCs in the region.

But you can get a good sense of how the community is growing thanks to https://vinteum.org

their most recent conference https://satsconf.com.br/agenda2023/

and hackathon (satsconf_ x has several mentions of this event)