This happens all the time though, and it's expected it might happen when you do it.

I live nearby a couple of lakes within a nice little forest, me and some friends found a spot a couple of summers ago a bit out from the trails which we improved to have a fire pit, some log benches, built a mobile sauna, and left notes that its intended to be used publicly. We knew that at some point it'd be found, and potentially ruined. It kinda happened, someone broke the sauna, we didn't feel we were owed anything since we decided to make it public, we knew the dangers.