I’m sure you are right dartymoor, but that makes it even more crazy. Abandoned caches therefore cannot be collected even if a new CO places his new cache at the exact location of an archived one! There is enough geocaching litter out there already (much of which is active caches), allowing adoption of abandoned caches would at least allow the legal removal of such litter. Fortunately, in practice the new CO will always remove this, but as you say, he has no legal right to do so. Also as you say, a simple change in the T&C’s would change all that.