@holifeet: probably because the dev himself said countless of time the game WAS inspired by the fundations of Sim City. And also probably because both games share many similarities (UI, sounds, etc...).
/captain obvious mode = off.
I believe they actually said they were already discussing a city game, or they had even started making it, when SimCity came out.
I don't know where it was, but I definitely recall a video where they said they asked themselves if it was even possible to do a city builder once they realised EA were doing one.
I just think it's disrepectful to mention Sim City everytime they do an article on Skylines. That's all.