@pinakographos
I've noticed that too. What pissed me off even more than it being on by default is a) if you go into your Object Export Options it states that "This standard generative feature uses 1 credit per generation." and b) the alt text is generated for the entire image file not the cropped version one uses in their layout. So Adobe is forcing AI on all users while hiding the costs to generate an alt text that will be wrong by design.