> people became paranoid and jump to conclusion without any substance

Before AI, the only question was who made a particular artwork. Human-created practically a certainty.

When AI-generated art was new, it was all exiting & the process described to boast about AI capabilities or the skills of people deploying AI. But human-created still the default assumption.

Now, AI-generated <anything> is everywhere, and that default assumption of "human-created" is often questioned.

The natural next step is "AI-generated" as default assumption, unless claimed / shown (or even proven) otherwise.

Imho: assumption is the root of all evil. Investigate! Or take an author's word for it unless they're shown to be a liar. But as another commenter noted, it's a kind of tragedy of the commons. Methods to prove you as a human created <artwork> will be a thing.