No licence means that you can't even use the software. This seems very restrictive for a GitHub project

Have a look at the article I linked, the case of places such as GitHub is explained (TL;DR: the licence is derived from the TOS)

The article says you can view and fork the code, but it doesn't mean you can use it. It's very restrictive.

> Although a code host such as GitHub may allow you to view and fork the code, this does not imply that you are permitted to use, modify, or share the software for any purpose.

I stand corrected. Thanks for reading the TOS in detail.

Indeed, GitHub let's you fork but then you cannot do anything else. My understanding now is that forking makes no sense when there is no license.