> Where it starts to get frustrating is if they throw a fit when someone forks their open source project, or when they start rejecting PRs from other people but then lightly rewriting the code and resubmitting it as their own work.

Agreed, that's horrible. I would absolutely give credit at least for the idea behind even heavily rewritten code. And the freedom to fork is one of the essential freedoms of FOSS. Many people in certain organizations (cough GNOME cough RedHat cough) don't seem to get this. Typically the same ones who overlook key parts of the OSI definition:

> The license must not discriminate against any person or group of persons.

> The license must not restrict anyone from making use of the program in a specific field of endeavor. For example, it may not restrict the program from being used in a business, or from being used for genetic research.