Is it paint or something like a permanent marker?
Reason for asking is, aside from needing different removal strategies, painting on a vertical uneven surface can be quite difficult as the paint has to be thick enough not to run yet malleable enough to produce quite a uniform curved line or pattern.
I can't zoom in on those pictures but they look too neat to have been be painted on.
Maybe we should have sentences like the ones in Thailand? https://www.dailymail.co.uk/news/article-6293727/Backpacker-Liverpool-faces-TEN-YEARS-Thai-prison-spraying-Scouse-Lee-fortress.html
Something is not right. This message is just to keep things from messing up down the road