Copyright is always about distribution. So yes, you are allowed to fork, but you are not allowed to distribute the copyrighted content to other people. And with the No Derivatives clause you are also not allowed to change it. You might be able to stay in the gray are by telling everyone “build it yourself”, but nobody would be allowed to package it either.

As far as I can see the company behind it (Starfish Neuroscience) is not affiliated with Valve in any way? (Aside from having the same CEO)

Yperating System?

Like Firefox

(partially kidding)

Seriously, for me a “China scientist” is someone doing research on China, like a space scientist would do research on astronomy and similar. But I’m not a native English speaker, so, idk

Gitea has basic federation, I believe

This will only make models of bad actors who don’t follow the rules worse quality. You want to sell a good quality AI model trained on real content instead of other misleading AI output? Just follow the rules ;)

Doesn’t sound too bad to me.

Researchers can’t make a breakthrough if they don’t try ^^

Creeper World 4, the daily map usually has a good duration. Takes your thoughts off everything else pretty well, yet is not too demanding. And you can vary your play style yourself a bit / set your own limitations, depending on how much of a challenge you want right now or how much time you want to spend.