[IIsi50MHz]

Perhaps I'm part of some A/B test. Most of these affordances have in the past few days disappeared from Prime Video, so I can no longer filter by "Free to me" (a filter which it frequently would forget, anyway!) or see a little "Prime" label on the corners of included stuff. Instead, I now far more "free with ads" items (as entire rows, or mixed in with other stuff).

4K worked for me for a few weeks when they had a special "Ultra HD" category. After that, items that would claim that label streamed in at most 1080p. Other providers continue to provide the expected service: sharp image when fullscreened on my 5k display.