This is a fascinating development, especially for type 1 diabetes, where autoimmunity is such a challenge. Using the patient’s own reprogrammed cells to avoid immune rejection is promising.
Double dipping with adverts is the way. Amazon, Spotify, dropped them all after they started pushing adverts as well as getting their monthly cost. It's not new -- cable/sky TV was exactly the same (although sky one was the other way round - started with adverts, then added a subscription fee in 1993 [0])
The far bigger problem is that the majority of people accept adverts. They don't consider them a cost. Last time I got a yellow cab in New York it was adverts on a TV screen in the back. I get ubers if I need a cab now.
The future of adverts was accurately predicted in idiocracy [1], and of course Futurama had comentary on this a quarter of a century ago [2]