This isn't like Netflix where a cheaper, inferior plan was introduced. They're taking the current ad-free service introducing ads to it.

You're going to have to pay an additional $3/mo for no ads along with your existing $15/mo (Prime), $139/yr (Prime) or $8.99 (Prime Video only) plans.

This doesn't look like subsidizing to me. To me it looks more like "pay us more because we can do whatever we want".

https://www.aboutamazon.com/news/entertainment/prime-video-u...