At some point Newgrounds changed how stuff appears when you search for something. It's annoying sometimes when it fetches words that have similar letter arrangements, resulting in unrelated search results. But one big thing I've noticed is that pictures from people that are not "scouted" or pictures that weren't included in the art portal also appear in the search. If you can now find stuff that's not actually part of the portal then it doesn't really matter if I check the "include in art portal" box or not. Apparently there are also users that can rate pictures even when the option to rate them is unavailable, so I guess even less matters there.