Me too - it's as if the entire scene has "sold out". I'm younger than you are, but I entered the Free Software(TM) scene as a zealot and a true believer - you probably had to back in the day because the overall software quality of the entire ecosystem wasn't close to parity to proprietary solutions (some parts of it were clearly superior, e.g. Apache vs. IIS). I think this high bar resulted in a self-selected group being involved in LUGs and similar groups. These days, the bar is much lower, thanks to Github and the large number of high-quality FOSS projects that are market leaders - far better than proprietary equivalents.
My theory is that with this self-selecting filter gone, a lot of developers are now part of the community for self-serving reasons, so their attitude is ...mercenary. Its now all about "How does this project help me and make my life convenient as a developer" rather than "How does this project help software users like me": it's a subtle difference, but with far-reaching consequences.
I don't think we were naive - we thought we had won when corporations defected, but our victory was subverted and it feels more and more like most corporations are a fifth column. "Open Source Software" is slowly suffocating "Free Software".