Do explain more. My mentality is that FOSS exists and has thrived through viable business models. Very few people just do charitable OSS work without deriving any benefits from it. Those that do, don't end up lasting very long:

https://www.theregister.com/2020/01/21/rust_actix_web_framew...

https://web.archive.org/web/20110707151924/http://apcmag.com...

You can get paid to work on FOSS though. Google, Intel, etc… employees contributes to lots of FOSS as part of their jobs.