Prime Video now only offers a lot of things on "FreeVee" their ad supported streaming service. It's technically not putting ads in prime video, but it totally is. As 2 recent examples of things I watched, Jury Duty and Detective Pikachu cannot be watched without ads unless you purchase them. If you Google for "Stream detective Pikachu" Google will say it's available on FreeVee and Prime Video, but the Prime Video link redirects you to FreeVee.
Depends on your definition of ad. Netflix seems to be doing a lot of product placement.
Prime will require an extra $3/mo to avoid their additional ads in the near future.
I kinda wish streaming could basically become like something that maybe has some consistency between platforms and allows for some bundling packages... People can't afford 15 streaming plans, but maybe buy 10 get the last 5 free, and all the plans share based on shared data of usage (medium like model, views / subscribers = % of payout). They could have an added bonus, whoever refers the customer to signup gets an extra x%.