Follow-up.

Unity is not being helpful at the moment. When I tell them some assets just don't fit in their categories, their support basically lectures me about their new submission guidelines paperwork.

I understand they want to skim the Asset Store from old assets and force people to use newer versions of the Unity editor. Seems legit. But their new submission guidelines are just ridiculous : for an asset to be exposed, it should be uploaded to the store from _each and every supported version of the Unity editor_ (a multi-gigabyte download and setup each time) !

I've shown them some numbers, and heavily insisted on the fact that everybody was incurring losses with that new policy, let's hope it'll change something.