Apart from the risk factor of being cought on camera as pointed out by others, I'd like to add that probably there will be few chances to actually graffiti self

Apart from the risk factor of being cought on camera as pointed out by others, I'd like to add that probably there will be few chances to actually graffiti self driving cars. Autonomous cars have the ability to go places by themselves. So the most efficient way to use them is to have on the streets just the right number of cars based on the demand. Because demand, once the service is fully deployed, is quite predictable (this is already so for services like Uber and Lyft), the most likely scenario is that autonomous cars will be on the streets only insofar as it's necessary to meet the demand at any given time and place. I wouldn't be surprised if in a short time, thanks to ML, they'll be able to predict where and when pick-ups will be requested by users. Since it's quite likely that autonomous cars will be busy going to pick up users, or transporting users, it is very unlikely that they will give any chance to "artists" to make graffiti. Moreover, when cars are not used, given the relatively very expensive equipment mounted on them, it's very likely that these cars will be parked in surveiled areas. So, the way I see it, it is very unlikely that graffiti will be a problem. There might be few cases, but nothing systemic.