Open source was never about "free as in beer", it was about "free as in speech", which even in the civil rights sense is not absolute. Communities and ideas evolve, and it does a disservice to those who have contributed in a material way to the non-commercial software space to color them as heretics for trying to protect themselves from competitors with effectively unlimited resources.
I stay away from anything hosted by a startup for exactly that reason, and just yesterday someone looked at me funny for saying so since the last example was being forgotten.
(AFA any commercial product, that is the whole point of looking for a REAL open source community where other individuals might drop out but Apache, Debian, etc isn't going to tell you that they don't like their 501c status anymore.)
No true scotsman. If it works for the stakeholders, it works, regardless of what you want to call the model, whether that's GNU/Linux, Redis, Elastic, or Sentry.
GPL exists partly to prevent this kind of conversion once the community is diverse and non-profit project hosting is a good place to look for a community. It would be nice if everyone knew that and kept it in mind, but clearly they do not.
I don't really get what these growth startups are supposed to be and for people who contribute nothing back maybe buyer beware is fair.. But it is dishonest to create these company sponsored communities that convert after taking input from individual contributors. Plenty of people try to help a community with out considering that this kind of thing happens and these products compete directly with real open communities through this temporary branding.