I've already paid subscription fees for both Netflix and Amazon Prime, and I feel it's unfair to be expected to pay extra for an ad-free experience.
As a subscriber, I chose these services to enjoy uninterrupted streaming. Introducing additional charges for an ad-free experience feels like double billing, given that the whole point of a paid subscription is typically to avoid ads.
I think it would be more reasonable for these services to offer an ad-free experience as a standard feature for paid subscribers.