Why? Carving your name into stuff that you don't own is dumb regardless of how old it is.
Such graffiti is only an artifact when it's purpose, history and other aspects are lost to time due to lack of alternative documentation.
In effectively all cases these days there is simply no additional value obtained from graffiti like this, unlike that of street artists doing murals or painting trains.
https://www.nps.gov/subjects/nationalregister/how-to-list-a-...
Tbf, sometimes graffiti is a territorial marking and this is also a likely function.
Definitely the kind of thing you’d read in an art history book.
I also have no credence for this forum to not be hypercritical of art history literature, but here I am talking about it.
Clearly most people find the act memorable, manners be damned.
(I find the act barbaric, personally.)
https://davidsbeenhere.com/2017/03/01/top-10-ancient-sites-i...