Commercials and TV episodes could have a basic "story arc" and then completely customized to the viewer.
Think about the simpson's or something. Imagine that the story of the episodes were kept, but you could swap in the characters and locations. So for instance if you lived in Nashville TN, all the simpson's episodes could be generated to show the settings as Nashville instead of Springfield.
Then you could have the AI switch out the characters to be people you want. Maybe you want to replace Lisa with an AI Simpsons version of you. Mayor Quimby with Nashville's actual mayor, etc.
I think it'd kind of defeat the point - I can't imagine a person that'd want their likenesses to be used to market to them. It'd be a disaster. Setting swaps are more realistic, though at the point where things get good enough for that to be possible, we may just see completely on-demand newly generated media instead of modifying what already exists.
That is a hell-scape (to me).
Inserting yourself into shows... that's feels different, but my gut tells me advertisers will corrupt that idea quickly. Product placement...
If anything it was a turn off and I was confused how they knew where I worked.
I used to get ones that said “Comcast user you are insecure” and stuff.