Well I've entered a lot of people who aren't my ancestors. Most of them are, of course, cousins. But even if there's not a direct connection, a person may have other reasons for maintaining PM status. They may know people on the line, they may be former neighbors or school chums, or even ex-spouses. Wiki does have a rule which keeps members from hoarding all the people they've ever been a PM for. That is, if you have more than 5000 profiles you should release some of them to get back under. Now I expect that I have about 100,000 people in my computer family trees so I could never be PM for more than 5% of them on Wikitree. So far I've only added 800, though there may be some which I attach to and so wouldn't have to enter in myself. Now that said, I expect most all members would be happy to let you be on their trusted list and even to be a co PM. Beyond that, I don't see why someone should be forced to relinquish a PM status.