Great news in some ways. Unity has been on a poor path for some time, boiling the frog in the pot. But with a move so egregious, it's much harder to sweep it under the rug and keep going.
Also good news for game engines that treating their communities with due respect. Unity has been called dead a number of times, but now they have fucked with people's wallets in a way that totally eroded trust. Unity the company is a busines liability now. No one with any sense would accept that risk over the other great engine options available.
Sure the other engines coule pull a similar move, but only Unity has proven that they will actually do it.
They have now deleted the repo, so I wonder if they're just gonna pretend they never committed to that.
1. https://github.com/Unity-Technologies/TermsOfService 2. https://blog.unity.com/community/updated-terms-of-service-an...