There is a huge amount of copyrighted material in the world and these tools let you create a lot of content in a short time, that would imply an increased risk vs slower, more manual approaches.

What I am also wondering is, if for some things copyrighted material could be somehow dominant in the output (beyond prompting more or less for it).

> what's so different about having an LLM generate that image?

You don't have to pay 20 bucks a month for a private company to reproduce Mario manually at home for a start... you also can't reproduce Mario in many poses at an industrial scale solo. The list can go on, and we have seen OpenAI change their license agreement, so the risk can change over time.