Why must everything make money?
If you have money to gift, I can take it if you don't mind and than I can help myself and others to work for free on FOSS.
To provide a counter-example you’d need to reference an open-source project that makes money selling the source code which, hopefully obviously, doesn’t exist, by definition
https://www.theregister.com/2023/02/24/who_writes_open_sourc...