and you can easily just drive your car into somebody to kill them.

DDoS services are almost always purely malicious (you can _may be_ argue that you can use them for pen-testing or load-testing). But cars are not just purely malicious; there's a lot of useful things cars can do, and that's why the dangers of car ownership is outweighed by the benefits, as judged by society - we just have some road rules, and licenses, so that people know to use them responsibly.

Why not the same with an AI model?

we are talking pictures atm. not videos. I bet you could get as good as SD with two weeks of free time, lots of youtube tutorials and with a photoshop license.