For paid staff see https://wiki.osmfoundation.org/wiki/Contractors_and_employee... (note that for example accountant is not contracted full-time)
(and yes, donations are welcome! See https://donate.openstreetmap.org/ if you want to help)
disclaimer: I am an unpaid volunteer on OSMF board
[1]: https://www.datanyze.com/companies/openstreetmap/353811364
I doubt the 12.4 million revenue. The 2021 financial report listed turnover of £350,000 with surplus of £160,000 and £740,000 in reserves.
Also, how is it not public good, and how does it enriches someone else’s product? I’m fairly sure the world’d biggest encyclopedia that is freely available to anyone on the Earth can be considered a public good, can’t it?
The power is in the brand/execution, not the code/idea
Either way, I'm glad that it's both open data and open code (Wikipedia: creative commons; OpenStreetMap: open database license; both: some open code license) so that we at least have options, should it be necessary, even if it's an uphill battle to divert attention from a spoiled brand
"Just mirror PBF files." is easy, mirroring community is harder.
But, yes it reduces some risks. And enables for example https://www.opengeofiction.net/ and https://www.openhistoricalmap.org/ which use OSM stack for fantasy and historical mapping.
And OSM open data is used very widely.