> and share with with other companies

Is there any evidence to suggest that the likes of Netflix and Disney+ are doing this?

I would check their privacy policies if this is allowed, regardless if it is happening.

Of course, if the privacy policies do not include a data sharing provision, then evidence of the sharing would be interesting.

Even if they aren't doing it today, if the policy allows it you can guarantee they're at minimum collecting the data. Perhaps for "improved suggestions" now, but could just as easily be sold to a third party later should the financial incentives be high enough.

Honestly if it’s like the viewing data I saw when I worked in cable, your watching habits are not remotely unique and you can be more effectively targeted using the data pulled from a credit check.

Viewing data is largely used in aggregate to make decisions about content. They’ll collect demographic data because it’s useful to know, but by and large it’s all used in aggregate or as cohorts because there really aren’t enough permutations. On a streaming service like Netflix or Disney there just isn’t enough content for people to look all that different at an individual level.

“User X watched Y minutes of movie Z at time W at location V using device T”

You might not care about Z, but the rest of those variables could be sensitive.