That's to avoid trademark infringement.
It used to be the same case with CentOS early on. Check out the "CentOS Overview" section in this version, with references to "a prominent North American Enterprise Linux vendor": https://web.archive.org/web/20050322010830/https://www.cento...
IMHO the proper purpose of trademarks should be to prevent consumer confusion. From that perspective, it’s absurd to have to dance around mentioning a trademark in a context where you’re explicitly stating that your product is different from it.
>> From that perspective, it’s absurd to have to dance around mentioning a trademark in a context where you’re explicitly stating that your product is different from it.
I don't think being a downstream release of RedHat very different from it. In fact, that's kind of the point.