Certainly, the are a fair number of contributors in Europe and both SUSE and Canonical are European based. I still think it's hard not to think of Linux as fairly US-centric however if only because of how many large US companies use (and contribute to) Linux.

Valid, I've noticed that a lot of non-US contributors work for American corporations too. It's a bit ideological for me ("OSS is global") so I think I might gaslight myself into believing it's more equal than it is.

I'm happy wherever the contributions come from either way but I will never call Linux US-centric!

Lennart Poettering(German, works for American corps) comes to mind as an example, though not a kernel developer.