Well, I don't agree that they have NO idea of what slop is. Basically everyone has some idea, see how often many different people here on HN comment "this is pure slop".
Also your claim "they DON'T WANT to have to define" is unproofable. Neither you nor me have any insight into what "they" want or don't want.
I think, for these two though errors your train-of-thought is already invalid.
Further, I'd even argue that precision in such a definition isn't necessary. Especially that the assumed non-existence of a definition would lead to inaction.
But ... if that would imply that we cannot do any action because we don't have a perfect definition, then I again would disagree. In "real life" we e.g. have laws that defines various crimes, e.g. "theft", "murder", "terrorist act" and what not. None of these definitions is perfect. Often they match, but every so often it's not really clear if they apply. In such cases a judge or a jury has to decide.
And that is possible today with things that people perceive as "slop". Someone could just decide. Based on a (imprecise) definition, based on tradition? Like in the judicial system.
There are also many cases where people don't use definitions and still exactly know what's going on. Look e.g. at 5 year old kids. They start to have an idea of property -- and are already very good to know then "this is mine" or "you thieved it" applies and when not. I am however quite sure they can't recite a definition of property or thievedom.
> I don't agree that they have NO idea of what slop is.
There's no way for anyone reading their rules to know if their projects are slop. It's full of "mostly" and "significantly". That's virtually guaranteed to boil down to "we don't like it".
So "they didn't know how to define it" is about the most charitable interpretation I can muster. Alternative interpretations, such as "the vagueness is a feature since it enables selective enforcement", are also available, and they only get more and more uncharitable.
> Also your claim "they DON'T WANT to have to define" is unproofable.
Had they wanted to define it, they would have done so.
> Neither you nor me have any insight into what "they" want or don't want.
I have insight into their actions, and I'm perfectly capable of inferring context and motives from them.
> I'd even argue that precision in such a definition isn't necessary.
None of this is strictly necessary. Nevertheless, it is desirable that things be precisely defined so that people can know where they stand. Depending on the exact definition, I may or may not be welcome. Therefore I'm not going back there without a precise definition.