Thanks for the info, interesting.
There has been some negatives towards a short family trail elsewhere in the uk where you had to pay to get into a park area to complete it.
That said, Centreparcs are advertising a geocaching activity at several of their places where you hire a gps and follow their trail. I don’t know the details, but I understand it’s nothing to do with gc.com and doesn’t list the caches there.
We all know you can’t advertise names, even charities, in descriptions, titles etc – but you can put caches where paid parking is the only option thus making them non-free to drivers at least.
Anyway – only way to be sure is to ask groundspeak!