The job market doesn't want employees, or business owners, it wants slaves.

I know plenty of people who went into contracting (aka self-employment) and later found full-time jobs (frequently with clients) across multiple white collar industries, including programming. They were all in their 30s and 40s. In many cases, going the self-employment route actually made them more valuable to future employers. I also know plenty of people without a degree who went into programming.

Over the years I've built my own Linux distro from scratch, developed a heavily customized version of the Chromium web browser, and other interesting stuff.

If this were true you'd be gainfully employed by now. Coming out of COVID, companies were hiring people just because they knew what an IDE was.

Based on your comments though, it's easy to understand why you haven't been able to find a job. I wouldn't want to work with someone as negative as you and I can't imagine anyone would want to work with someone so emotionally draining.