What a terrible fucking take.
First of all yes it matters. OSS developers not being able to pay their bills despite maintaining software used by trillion dollar corps has been in the news several times. It’s an ongoing issue and talked about a lot.
Second, “go get a job” is essentially “stop doing open source”. As in “I would rather have you write closed source software than source available/open core”.
This isn’t your decision to take. This isn’t your life to live. And this isn’t your culture to dictate.
Also, you live in a bubble if you think the majority of people give a crap about the OSI definition. I say this as someone who does give a crap (though not that big of one).