I was watching Yellowstone on Prime back in 2021, before they moved it to a premium tier, and the audio was always out of sync when using Prime Video, so I had to adjust the audio sync latency, and remember to switch it back when watching other content.
After a while, I gave up and just watched it on my Plex server instead. I could also use the Watch Together feature to watch it synchronously with friends, a feature not supported by Prime Video.
In my case, the piracy (if you call it that, when I was at the time a Prime member) was absolutely a UX issue, not a price issue.