A license (copyright law) is not a contract (contract law). Simply publishing something does not make the whole world enter into a contract with you. Others first have to explicitly agree to do so.
> Sorry, but the onus is on OpenAI to read the licenses not the creator.
They can ignore it because they never agreed to it in the first place.
> And throwing your hands in the air and saying "oh you can't do that in a license" is also of little use.
It is very useful to know what works and what does not. That way you don't trick yourself and your work to be safe, don't get caught by surprise if you are in fact not and can think of alternatives instead.
BTW, a thing you can do (which CaptainFever mentioned) and lots of services do because licenses are so weak is to make people sign up with an account and have them enter a ToS agreement instead.