Zigbook Is Plagiarizing the Zigtools Playground

Who cares? They aren't selling it.

Misinformation and poor learning tools can do real damage to the experience of new zig users, which is incredibly meaningful.

Neither are the Zigtools folks. If you've ever run an open source project, you know that instead of running on money, they run on community goodwill. Having people take the project's creation, claim it as their own, and not comply with the license, are all damaging to people's motivation to contribute.

Censorship is even worse

Requesting attribution (as the MIT license demands), hardly rises to the level of "censorship"

I think they are referring to the fact that the zigbook maintainer defaced the PR that fixed the license issue by editing out the PR description.