Wayspots appear in Ingress 12-48 hours after being accepted. (Unless the sync is broken and it takes longer.) I don’t know how how much time after Ingress syncs, until IITC syncs.
But yes, your point is good - that the FourSquare and Courts of the World wayspot uploads appear only in PokemonGo, so are not on Ingress or IITC.
One other point: reporting a location for being “adults only” does not work. Gum Club / Shooting Range - #13 by NianticAtlas