> Do they all have other jobs and using their spare time to devote to such a serious project?
Yes, except when <daywork> is also OpenBSD related. But that has nothing to do with the foundation.
> $87.5k in 2022?
The year isn't over... and there should be some left from bygone years.
> That doesn't even pay for a single person after taking the rest of the expenses into account.
I'm not aware of a single full-time paid developer, by the OpenBSD foundation. It's more a gig thing. In addition for Hackathons the foundation pays for the venue and network, and the developers usually fly themselves in.
The foundation was founded b.c. the CD sales (back when there were still CDs sold) didn't even cover electricity and network costs of the main site anymore.
It's all done like in the good old days of Linux, before big business stepped in.