An arificial intelligence that somehow managed to stay inside internet only and wreck it would still be a gigantic problem for humanity. Simply because it would

An arificial intelligence that somehow managed to stay inside internet only and wreck it would still be a gigantic problem for humanity. Simply because it would be very hard to get rid off. Assuming the "usual" cliches that the AI would be very smart, it could get rich (e.g. by stock market, robbing the banks, or just creating some good products) and then use its money to block humanity from creating some sort of a "internet 2" - by which I mean a network simply without this entity. Also with how much we need internet, how easy we are to spy on due to smartphones... a "war" between this entity and humanity would be a problem. The AI wouldnt even need to build a robot / terminator to connect from one network to other. Just pay someone to make a link.