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Remember everyone quickly speculating whether Black Mirror: Bandersnatch was a data mining experiment. I used my GDPR right of access to find out more. (short thread) #Bandersnatch
Netflix claim they only use individual choices to inform which video segments to show, although they do learn from aggregate choices, as would be expected. 
You can also get a copy of all the choices you have made to date, which Netflix does store (I did not ask for how long). They provide it through encrypted email (@virtruprivacy), a PDF file with a data key...
... and a .csv file with the choices you have made, when you made them, the platform you made them on and whether you had watched those segments before.
(geeks like @fborgesius might like to know the basis for this processing is contract).
Interestingly, the 7 pg key looks pretty exhaustive. It would be hard to hide a deep easter egg (& I don't see an obvious one, eyeballing). They key is commendable: as even @NOYBeu noted, Netflix seems comparatively good at intelligible access requests
I asked a further question they are still processing about a/b testing groups that they are still working on. For the interested, the request I made (to privacy@netflix.com) is here:
