I think you're missing the reciprocal nature of the arrangement here. Since you seem to assert that it's acceptable to release software under a proprietary license (and I agree with you, most of the time), you must believe that the authors of a work have a right to distribute it under whatever terms they like. So: is it appropriate for someone to say "I am willing to offer my labor to this collaborative project, and release the source code for free, and allow people to build from my work, under the condition that they extend the same rights back to everyone else"? It's much more generous than what proprietary software offers, after all.

Why is copyleft subject to more scrutiny than proprietary software for you? You suggest that permissive licenses are better because they allow permissive derivatives of the software, which suggests that permissive derivatives are good. But copyleft derivatives are... not good? Copyleft offers more freedoms than proprietary software.

Moreover, this line of reasoning completely disregards the social contract. Many people worked on, used, popularized Redis under the presumption that they were participating in a collaborative effort from which all participants would benefit, only -- surprise -- now the trademark holder has changed the terms so that only they benefit from a product of which, by objective measures, 80% was made by the community.