Spoken like someone from the universe where paid services do not still show ads and engage in countless other user-hostile behavior.
* All of these platforms favor algorithmic recommendations (which are ads) over your personal content queue.
* A lot of content on Prime forces you to watch an ad of new Prime content before your show starts.
* Some of these platforms have auto-playing previews that distract you while you are navigating. Sometimes you can disable them, sometimes you can't. Sometimes the setting resets itself. These are ads.
I'd add that if one has (permanent) control of the recommendation and auto playing then they're less like ads and more tools. Especially if they are opt in.