I also think that there are partnerships and partnerships…
It would be interesting to know how Fairphone ended up in this series, but my guess is that Amazon didn’t give Fairphone anything and that Fairphone didn’t pay anything to Amazon (so not really a product placement). I would guess that Fairphone gave one or two phones for the shooting, that’s all.
I haven’t seen the actual series, but looking at the pictures and reading @huskers’ message, I understand that the phone is a central question in the show. I wouldn’t be surprised if the producers/writers/director had already thought about the question of the battery and the tracking and were looking for a phone company with removable battery. I wouldn’t be surprised either if one of them already had heard of Fairphone and thought “maybe I can use this in my show!”
But @Moritz’ question remains:
About acknowledgements: someone I know was thanked in a book without knowing it in advance and wasn’t really happy to be thanked as he didn’t want to be linked to this book…