these filters at dns are usually websites not keyword based.
if you want adult filtering use adult filters and safe search. You're turning off adult filtering and safe search, and then saying you need to do something else to stop adult content and unsafe search.
The point is the problem you claim can be solved by using the tools to solve that problem.
Not blocking im-gay-and-alone-help-me.org
BTW the category exists for other conservative countries such as the Middle East.
It is equally naive to assume it isn't being specifically used for censorship. There will be Cloudflare customers who will move if this a global deployment at Cloudflare.
Biting the hand that feeds IT
