You have 3 options:
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Android TV/Google: bad for privacy, some devices can be customized for slightly more with tweaks, ADB, etc
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Apple TV: pretty private compared to Google, no ads out of the box on Home Screen, nice hardware that lasts awhile.
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Wilderness of roll your own on a mini-PC, raspberry pi, etc: no ads, private. But pain in the ass, no 4k, no full HD (720p max), no HDR, no atmos sound because not locked down with DRM for streaming services so not approved. Choose this only if most of your content is self provided Blu-ray’s or yo ho type stuff and/or YouTube. Otherwise miserable experience.
As far as 1) goes there are some better options like Dune-HD (make sure to get a Netflix certified model so you get 4k support from streaming services), and some customization via changing launchers and such for more privacy.
However only options 2 and 3 are really more private IMO and “fixes” for Android TV devices mostly are in the form of blocking ads and allowing side loading of say a custom version of YouTube with ad blocking so don’t and can’t address the under the hood spying Google is more aggressive about.
As to getting away from American. Good luck, both major platforms are American companies. Only other option is Chinese fork of Android and it’s no good for western streaming or use outside China. Otherwise roll your own but also provide your own content and that gets you away from them. A mini-pc is great for that with an air mouse but it’s not the same finely polished experience though can be decent with a little work.
Not directly. There are some hacky work-arounds that may or may not work:
https://redlib.catsarch.com/r/Stremio/comments/18s55cy/how_to_use_stremio_with_infuse_on_apple_tv/
https://redlib.catsarch.com/r/debridmediamanager/comments/12id1dj/streaming_movies_and_tv_shows_on_apple_tv_using/ This suggests adding it as a webdav source may work.