People really have any expectation from Google devices?

Even android which whole marketing is that it is "more open" only receives self-serving features. Btw, the access to chrome-cast is baked in the playStore service. So your app has to be compiled with full google play store tracking library to use it. ...i used to help maintain a version of fenec (firefox for android) that was build without chromecast support just because of this (and if you want it, gnu now maintains a better version called IceCat)

Oh, and even plain-open-source projects... there were 4 attempts to have an option to disable referrer on chromium. All of them reverted by google employers on unrelated commits. So even chromium is not that safe.