I'm not misreading it. The license says we cannot fork the software. That's not open source.
Hell. I just clicked the 'fork' button. Where's my cease and desist?
Open Source need not be free as in beer, nor as in freedom.
We have discovered that there is virtually no chance that the U.S. Patent and Trademark Office would register the mark "open source"; the mark is too descriptive. Ironically, we were partly a victim of our own success in bringing the `open source' concept into the mainstream.
https://news.slashdot.org/story/99/06/17/0213251/esr-on-the-...
"Open source" as a term or development methodology is older than both the OSI definition and the Debian manual it is based on.