Honestly this was a really welcome episode. I'm glad to see that Brooker has not turned his back on writing dark tales that don't need to rely on future technology or dystopian sci-fi to feel relevant. There is more than enough "commentary" in here the ethics of true crime content and money hungry streaming services just to name a few. No complaints with any of the actors or performances in this episode and it was great to see BM returning to a UK based epsiode, made me nostalgic for the Channel 4 years.
I think a lot of reviewers on here have missed some crucial points in this episode. Many are complaining that there was no technology based element to this episode which I find ridiculous. The technology was there and it was key to the plot, it was simply analogue technology rather than futuristic technology. It was the characters discovering tapes and digitising them (making use of once futuristic technology and bringing it in to the contemporary) that led to the whole secret being uncovered.
Honestly I find it confusing that people clearly missed the point with this one.
And there's even reviewers on here complaining that the ending was confusing? If you found this episode confusing I don't think Black Mirror is the show for you. Clearly.