More problematic than this is that there are many images on Adobe Stock that were stolen and put up for sale by parties entirely unrelated to the artists who produced them. Worse, they don’t make it easy to report image theft and generally aren’t responsive when reached out to about these issues.
It’s not happened to me personally but I’ve seen artists I’m a fan of fall victim to this.
So any claim that Firefly was ethically trained is questionable at best and mostly just feel-good marketing.