If you want true, verifiable privacy and control, it's not an Apple TV that you need. Any old laptop or desktop computer can be used to stream content from the Internet using a Web browser or other "apps."
E.g. Netflix doesn't let you to stream 4k video in browser afaik. So no, it's not a good option.
E.g. Netflix doesn't let you to stream 4k video in browser afaik. So no, it's not a good option.