[MacsHeadroom]

Yes, in fact a managed private campground with fines is compatible with anarchy provided the owner doesn't have an effective monopoly on places to pitch a tent outside of their campground.

Even if they do have a monopoly, a large group with an effective monopoly on paying campers over some timeframe can negotiate an agreement for reduced or no fines.

Anarchy is about power relations. If they're relatively equal, it's anarchy.