Removed POI

Is there a way to know which POI were removed? I submitted a POI that has been removed a while back (I did not know), so I 'lost' an upgrade.
It was a valid POI that was probably removed following a complaint from someone living close to this. It seems that every time we try to submit something in this small cell, it's rejected, even if it seems a valid nomination. Have you ever experienced something like that? Is is possible that a cell can no longer have a POI even if it's not the same that the one rejected?
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The property owner can request Niantic to not allow any PoI in their property. Here's a recent example where they have confirmed it:
Thanks. So you know that, but are we aware of any mechanism preventing someone else to resubmit?
No, there's nothing preventing submitting clearly invalid nominations like duplicates of existing wayspots.
There might be some other issue with your nomination, post your data in the "Nomination improvement" section