The Prime-nag-screen on every checkout is so annoying as well. The "no thanks" cancel link is very small and changed its location the last few months. Increasing the delivery time just to introduce Prime (I lived in an early test region of Prime back then).
Loyal customers that buy from the online shop since 1999, don't count anymore. If I as customer decide that I don't want your subscription service, better respect it!
Prime Video, and some of the other non-shipping Prime services, are really getting on my nerves. They can't be cheap to operate and generally have a limited-enough selection that I don't bother checking them anymore (for example, the only notable books on their Kindle Lending Library service are Harry Potter and The Hunger Games, while everything else pushes you to the for-pay Kindle Unlimited). Add to that the awful UI work they do (they mix Prime and non-Prime, for-pay video, the completely confusing Amazon Music interface, etc), and it's a boondoggle they need to seriously re-think.
The flip-side of that is they do run some programming that likely wouldn't find a home anywhere else (Transparent is excellent, and I highly recommend watching it if you'd like something to challenge your world-view).
Amazon uses a surprising number of dark UI patterns considering how solid their market dominance is. And they really push their branded credit cards, too. I'm not interested and I never have been, but I've still been forced to turn these offers down for more than ten years now.
Loyal customers that buy from the online shop since 1999, don't count anymore. If I as customer decide that I don't want your subscription service, better respect it!