Linux

The thing is, if all other things remain the same, an absence of copyright will also be used by the wealthy and powerful to further enrich and empower themselves and as a tool of oppression.

From the Ferengi Rules of Acquisition:

#34 War is good for business.

#35 Peace is good for business.

You cannot have internally consistent, principled view on copyright without also having a compatible view on the economy. And even then, the economy needs to come first; you cannot start destroying load-bearing pillars, no matter how ugly, without first getting everyone out of the house.

The tool in itself can really be usefull when well used. Many people use it and get nice results.

The way I see it, there are two kinds of people: those to whom AI is utterly useless because it just ends up taking more time and have them burn through their cognitive endurance faster, and those to whom it would be irresponsible to let them use it, because it would prevent them from finding better solutions for the busywork they're letting the AI do, and they just end up creating a lot of needless maintenance overhead.

But more importantly, being "useful" to certain individuals is not the same as being good for society. Which brings us back to it undermining licenses like the GPL, which would further enrich and empower the already advantaged.

Also, I can’t find any example in history of a technology that was successfully banned despite being usefull.

CFCs? Asbestos? The bans on them aren't perfectly enforced, but nevertheless, the hole in the ozone layer is shrinking and the number of people dying of asbestos-related lung cancer is reducing, so they do have value.

The strict “no-AI” movement has already lost its battle

Even if it were true, that would be no reason to stop trying or to stop saying the truth: No matter useful you experience it as being, you are causing harm. To yourself, to the field, to society.