Yeah if they only cared about misuse of their brand they need only enforce their trademark. But they're also arguing the other way and don't want anyone to strip their brand from their forks either:

> bad actors taking our work, stripping the branding, selling it as their own, and giving nothing back.

Contradicting their original BSD License which welcomes anyone freely using, sharing and building on OSS software, even commercial forks. So now its a custom BSD-based license but with the aim of preventing competitive forks.