You can edit, tweak, and destroy other players city's in Sim City
It seems as though a YouTuber by the name of UKAzzer has found a way to go into anyones account and literally take over there city by tricking the games online functionality from seeing you as just a mer viewer to you owning the city!
Thus, you can take total control of the city! For more info how, check out the video description. UKAzzer stresses that nothing was synced to the severs, but I'm sure that wont stop players (like me) from wreaking havoc on a city near you!
This also shows that you can screw around with your city without it being permanent, another issue that has been stressed by players. Boy oh boy EA, looks like we have yet another entry in your tale of woe, hope those microtransactions work out for you guys!