Not a lot, you can see it on the development statistics that LWN releases for every major kernel releases, for 5.7, it's only about 13-14%, so most people worki

Not a lot, you can see it on the development statistics that LWN releases for every major kernel releases, for 5.7, it's only about 13-14%, so most people working on the kernel do indeed get paid for it. https://lwn.net/Articles/821813/ https://lwn.net/Articles/821813/