They also have the resources to build a huge training set, together with people who willingly upload their art and photos to them, which they can use to make the training set better than publicly available data.
Firefly was trained on Adobe Stock images, openly licensed content and public domain content, where copyright has expired.
We do not train on user content. More info here:
https://helpx.adobe.com/manage-account/using/machine-learnin...
If you go to https://stock.adobe.com/ and search for `-generative` you can see it filters out ~3M of them, but then go to the "undiscovered content" filter, and it appears to me like the vast majority of it is generative too.
Stable Diffusion was trained on billions of images, of course. But having explored some of LAION-2B, it's clear that Adobe Stock has far better source images and labels.