If I was going to write something for free, it would some weird itch-scratching thing for Plan 9 or something, it wouldn't be something most people would ever want.

Realistically though, I'm not going to build software for free any more than I'm going to tidy someone's garden for free.

FOSS has delivered some great software, it's also demonetised a lot of areas where software developers could be earning a living. I don't think software developers should feel any need to give away their efforts than any other professional should.

FOSS has created pricing race to the bottom in software, and taken away financial incentive for improvement, it's not a 100% net positive.

Considering the strong opinion on this topic, OP is probably young enough to not remember (or know) the 80s and 90s with too few free options for personal computing and most of the software is proprietary and non-free (exactly as the OP states). While it fueled the traction of shareware, it was a very different epoch, and impossible today with strict controls from MS, Google and Apple on what app is allowed to run. It's easy to wish the world to be different, but it would be much harder to live in with the today reality of secureboot and AppStore controls.

its definitely a double edged sword. individual developers are generally screwed financially. if you can make something sass you might be able to monetise it but chances are theres a better free version floating around or that the majority of people just dont want to think about computers and will pay m$lop instead. you could sell your idea to investors i guess but thats heavy sales. should software dev even be a paid profession? with enough tools, automation would be within everyones reach, i think thats where we are headed in general.