That's only true if the picture was specifically commissioned by the company.

If it's a stock image or a licensed image, they need a license to alter the original image.

will not not necessarily be true for AI generated works in all territories

https://news.ycombinator.com/item?id=49382041

If nobody owns the work, then nobody can stop you from changing it, either.

if nobody owns the work, then anyone can take it from you.

It's generally a little more complicated than that. Not up to writing paragraphs about it so I'll just leave this as a note so anybody that's interested can do their own research.