I've said it over and over again, but I'll say it again.

Fixed gear that is not the bolts placed by the Preserve has no special status. According to both current rules and longstanding common practice, anyone can remove fixed gear and anyone can replace it. Of course, since the competence to place pitons has vanished among climbers who don't do alpine climbing and/or big wall aid routes, people with the will and motivation to place fixed gear anchors expect those anchors to become semi-permanent, and not disappear in a few days, as might easily have happened in the past. But those expectations are not justified by any Preserve rules or universally agreed-on community practices, and so anyone adding or enhancing anchors has to be prepared to see their work undone, and anyone planning on using such anchors ought to have an alternate plan in mind. There is no god-given right to finding a rap anchor where you want it.

Some people replace and/or enhance anchors as what they perceive to be a "public service," and in many cases people agree with them. On the other hand, removing anchors is also viewed as a "public service" by those who do that. Obviously, in many situations, we have different ideas about what constitutes a public service, which reflects the fact that, in general, there actually isn't a public that is being served, just groups with competing visions, not only of what climbing in general and trad climbing in particular ought to be about, but also about how climber modifications of the environment should fit in with Preserve ideals, which are hardly wilderness ideals and yet do envision limits on human impacts.