Was Adobe FireFly Trained on AI Stock Photos from Adobe Stock?

I had a question about whether or not Adobe firefly really is commercially safe.

I ask this because Adobe says that firefly is trained on the Adobe Stock photo library which they say is why it is commercially safe. But I also read, that Adobe lets people add AI generated photos to their Adobe stock library.

So does that mean that Adobe FireFly was actually trained on third-party AI photos that come from other AI generators like Dall-E, Midjourney and Stable Diffusion? Since these AI generators have used photos without license or permission, their generated photos are not entirely "commercially safe".

Or is it that Adobe trained FireFly on non AI generated images? If someone from Adobe could confirm this question it would be really helpful, because if Adobe trained FireFly on third party AI images, FireFly was trained on images that people didn't give their explicit permission for, which in a way makes it not commercially safe and in gray area just like Midjourney and Stable Diffusion.