I preferred developing minimal-dependency software but my customers demand fast good-enough results. The only way to deliver that is to glue together open source dependencies.
Now that 0% interest has ended 'regular' people like me are not flush with cash. Any time I have I need to spend on activities that will bring in money. Why would I waste that on open source?
(Another aspect is the McKinsey-ification of the work place in the last ~10 years or so. Managers are making decisions in tech now, not tech people. all my life I was told that OSS contributions will look great on my CV. So far nobody who has made a decision to hire me has had the background, interest, or knowledge to judge, or even care, for my OSS contributions.)