I'm a fan of Open core... the issues come down to a lot of the time, projects will reject contributions, and have pulled features that allow competition with their non-core features.

On the one hand, I really do understand the needs here, on the other I wish there was a better option.

I wouldn't even mind seeing something like the new MongoDB license + open-core as a non-profit organization that funded the development of several shared projects, where what licensing it does get is directly towards development. It's much different when you are absolutely profit driven.

There are a lot of software problems that are hard, but the results can be shared.