[verdverm]

The biggest complaint from open source maintainera is around freeloaders. People want projects and support for free, from primarily volunteer developers. Many toute the benefits without putting money where their mouth is. The open source community is more actively trying to figure out how we can support the creators, than it ever has been.

The question is about reframing how one thinks about their support of open source. The GP that is arguing that open core does not count as open source seems like the kind of open source user that wants it for free from volunteers without consideration for the effort and compensation that it requires and deserves. Open core is a valid way to build and support open source IMHO.