The only way to escape wage slavery without being born wealthy is to be a business owner and have that business scale.
I can see why people have these fantasies. Huge businesses have been built on open source code bases.
Many of us spend our lives writing software that has lasting benefit for our employers but our reward is a flat hourly fee.
The place where I disagree with your take is that commercialization and open source popularity are not mutually exclusive at all. The FSF makes this quite clear: open source is 100% compatible with charging money for some kind of service or for the convenience of a binary or something like that.
Software freedom is really about availability of the source code and your right to modify and distribute your modifications, not free as in beer freedom.
Commercializing it doesn’t have to mean bleeding customers dry, it can be something where most people are not paying a dime and are enjoying a fully open source experience. I think nginx plus is a good example of that sort of model. I have never met anyone who pays for nginx but there’s some big companies with big company problems that do.
Another example is Discourse forums. You can pay for support and hosting.