If I film someone in public, even though I own the copyright on the film since I shot it, I still need to get them to sign a release to be able to utilize their

If I film someone in public, even though I own the copyright on the film since I shot it, I still need to get them to sign a release to be able to utilize their likeness in my work. It's not a simple black and white issue and we'll need laws to catch up to address it. Claiming everything as "transformative" and thus you own the copyright as some do is silly. Otherwise, it would be legal for me to take everyone's Facebook pictures and "transform" them by putting them into the AI and sell the resulting AI porn.