Dangerous game. In Romania at least, even fixing a pothole would get you a fine, possible jail time and requirement to unfix it.
[0] https://stirileprotv.ro/stiri/actualitate/comuna-unde-fostul...
[1] https://stirileprotv.ro/stiri/actualitate/situatie-absurda-i...
[2] https://www.antena3.ro/actualitate/locale/satul-sa-astepte-d...
Guerrilla urbanism is pretty much illegal to do everywhere, including in the article's subject city of San Francisco. The goal is to not get caught by authorities while doing it