Products aren't projects, which has confused people for decades. If open source products retreating from some of the "freedom" elements bothers you, then you should be focusing your ire on the megacorporations and overfunded startups who simply refuse to contribute to the financial viability of the products that sustain them. For some reason "we" celebrate the exploitative, though, so I guess that's out.
Yep. The author complains that there used to be plucky startups with Open Core business models who've now gone "extinct", while simultaneously sharpening their pitchforks because those same companies got successful and _slightly_ amended their licenses to prevent loosing revenue against IaaS giants so that they can, in turn, continue innovating. I guess money grows on trees where they live.
The projects weren't as much open core as they were literal open source projects made to solve some problem the author had with other existing tooling. The open core part was injected when the startup decided it had to turn into a platform to sustain the beefy staffing budgets while they figured out how to generate revenue off something that was freely available.