CSAM was the lead in the 2024 news headlines in the French prosecution of Telegram also. I didn't follow the case enough to know where they went, or what the judge thought was credible.
From a US mindset, I'd say that generation of communication, including images, would fall under speech. But then we classify it very broadly here. Arranging drug deals on a messaging app definitely falls under the concept of speech in the US as well. Heck, I've been told by FBI agents that they believe assassination markets are legal in the US - protected speech.
Obviously, assassinations themselves, not so much.