Why are you so intent on giving them s**t about their licensing of their comments?
They cause harm to no one, they feel better because doing so is relevant to them.

I might be wrong, but your question seems asked in bad faith: I am under tbe impression that most people on lemmy servers have at least a basic understanding of the privacy and copyright infringements of the training of AI models.

Their will to license their comment probably has little to do with the very unlikely individual actions you describe and more to do with data licensing from big corporate entities.