For example, an individual can generate AI images of Hollywood actors using Stable Diffusion and a decently powerful computer. Said individual had the right to share those images online with a community.
Now however the sharing and distribution of said images is considered illegal in my USA state.
So, are the images said individual created and shared three years ago subject to prosecution? Even if the law went into effect 3 months ago?
No. The right not to be tried for actions that weren't crimes at the time is pretty universally applied in the west (I am not aware of the legal situation in other parts of the world, but I imagine it's honored there too). (Article 7 of the European Convention on Human Rights for the EU, Article I, Section 9 & 10 of the constitution for the US)
> So, are the images said individual created and shared three years ago subject to prosecution?
Generally, criminal acts are judged according to the rules of the jurisdiction where they happened, so I wouldn't be too worried about this. This isn't a universal rule though, so you won't find it enshrined in constitutions or treaties.
CSAM is just the excuse, as it is with any other laws of this nature in the past.
The ultimate goal is for computers to run only authorized programs and to license and monitor development tools like the Soviets monitored typewriters.
Chat Control would only make this sort of thing more frequent.