Not any action performed in relation to a work is considered “using”, or requires attribution or even permission. In particular if the work is publicly displayed, as it is in the case of data fed to recent LLM and image generation smortnets. To make a counterexample, nobody can require you to obtain permission to look at a publicly visible building (even in France, where there is no FoP!). Neither you have to make a proper attribution, when you describe what you have seen. Even if you do that commercially (a movie review, a travel guide, a map of an area etc.) I believe everybody agrees, these don’t constitute “use” of a work, despite some action and a kind of consumption of a work occurs. Of course courts and lawmakers may decide otherwise, but I can’t see it as a trivial case.
Considering a model itself to be a derivative work is playing with fire, though. It’s not a transformative action, that makes a work derivative, but presence of similar elements. A model does not contain them. So to consider a model being a derivative work, we would need to either make the transformative action or transformed (but not similar) content presence to be the condition. And this is opening a can of worms, because it widens the concept enormously. It’s easy to suggest it with relation to smortnets, but even easier to forget it will also apply to everything else.
Neither of the above relate to the output of the smortnets. The output may be a derivative work and infringe intellectual property. Like with any tool. Smortnets just seem to make this risk much higher to the user than other tools.