Sponsored segments is no different to Netflix (and other producers) selling "product placement" in TV shows or films. If anything they are far more subtle and effective as the viewer isn't usually aware.

I remember once watching an episode (can't remember the show) where the dialogue included characters talking about how good their new car was. The B-rolls would show almost every angle of the car too.

Sure enough, according to the end credits, the episode had product placement from the car manufacturer.

This instance it was a little _too_ obvious but I have no doubt I've been exposed to hundreds of in-film/show adverts.