Vast majority of software we use are based on open-source. I'd argue that stating "built on open source" is sort of paltering.

> But as YOU didn't build it or pay for it you have no place to complain.

I disagree with this point. You're conflating legitimate criticism or discussion about the model (which many have differing opinions on) with the harassment of open-source maintainers - something I strongly oppose as well. Could it be that past negative experiences have made you overly defensive? If so, I understand, but I believe it's a bit misplaced in this context.