Pokémon GO will show all the POI that are on the system when going to submit a new Wayspot. Pokémon GO Wayspots are marked as the PokéStop symbol.
Then the Wayfarer Pin marks any POI that are “used in other Niantic games”. This includes anything that is only Lightship, and would thus be marked as a duplicate by reviewers.
The same feature is due in January/February 2022 according to this.
So any day now?
I've had w things accepted that went straight to the lightship and as far as I could tell they weren't on the pogo submission map
Submitting portals takes time and effort. Why spend it if you already know it will be for nothing?
You could scan stuff instead with all the extra free time? 😀