Surely no one actually cares all that much about the video itself? The novelty is the fact the actual celebrity took some time to do something involving you or someone you know.
You can already happily Photoshop a hugely convincing signed celebrity photo, I don't see people who want such things affected by this or feeling the real thing is worth any less. Giving someone a deep fake as a gift or novelty would feel somewhat strange/hollow.
The component that generates would be distinct from the model used. You make the model freely available, but charge to generate. Highly unlikely we’re going to outlaw math distributed online.
Given enough time, assume you’ll be able to run this on a phone eventually.
You can already happily Photoshop a hugely convincing signed celebrity photo, I don't see people who want such things affected by this or feeling the real thing is worth any less. Giving someone a deep fake as a gift or novelty would feel somewhat strange/hollow.