[ctde]

people like me contributed their freetime afterwards still

[BeetleB]

People still do. I think the point he's making is that the bulk of the kernel's source coming from people paid to do it has been a thing for probably over 20 years.

[nomel]

Any data for this?

[betaby]

Yes, here for example https://lwn.net/Articles/915435/

[nomel]

Appreciate it! I tried, but couldn't come up with the right search term.

So, total being between around 60%!