If you fork an open-source project because you have a moral disagreement with the developers and then you pull upstream changes... what exactly is the point?

That's not taking the project in a new direction. If the project you're pulling from benefits from 'blood money' your fork does too.

It's convenient that the companies we're trying to avoid through our use of open-source software simply have to involve themselves in order for us to start friendly firing on ourselves and our alternatives.