I think this feels very manipulative. I don't really buy that the authors have general ambitions and aren't just interested in making bank in sales, because that's exactly what they say they're going to do in the video. I see a couple notes about video game characters talking to you directly... This tech is not the reason that problem is difficult but whatever.

The thing the urks me about this is not so much the ML, but... who actually wants personalized video ads? I think it is very uncomfortable for people you don't know to say your name like they know a lot about you. This would be be awful to me even it were paid actors, costs be damned. This gives the privacy problem a human face and, imo, makes it much more discomforting. What kind of marketing context makes it feel appropriate to send a personalized video message that will be warmly received but also cost prohibitive to actually make one?

Not familiar with Loom or Vidyard, but really this whole premise seems really creepy, neural nets or otherwise. It smells like the the ads that proclaim HOT SINGLES WANT TO CHAT TO BOYS IN {your age range} in {your town}.