Amazon Prime Video content no longer includes Dolby Vision HDR or Dolby Atmos surround sound in commercials, despite the fact that they were included with all Amazon Prime subscriptions.

The news was first reported by German website 4KFilme and first reported by The Verge. Instead of enjoying the high-fidelity options at no extra charge, Prime Video is now streaming in HDR10 with Dolby Digital 5.1.
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Specifically, only if you pay an additional $2.99 (~€2.78) for the service will you be able to enjoy the upgraded high-quality audio experience. This change was confirmed by Amazon, as reported in The Verge article.
“Amazon Prime Video Dolby Vision HDR and Dolby Atmos features are only available in the option , for relevant titles,” an Amazon spokesperson said.
Most Prime Video viewers are members of Amazon Prime, which costs $14.99 (~€13.90) per month or $139 (~€129) per year for an annual subscription. Prime Video is also available as a separate subscription for $9.99 (~€9) per month or $12.99 (~€12) per month with an additional charge for Dolby Vision HDR or Dolby Atmos surround sound. Ads were introduced to the basic Prime Video subscriptions in the United States on January 29.
Just for comparison, Disney+ costs $9.99 (~€9) with ads, while Netflix can be had for $6.99 (~€6.50) per month, but with ads, although the content is streamed in 1080p quality. On the other hand, Apple TV+ subscriptions have seen a significant increase.

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Apple announced this increase on October 25th, but there is no limit on streaming quality.
Source: macrumors.com
