I am skeptical that an attachment from Google, Amazon, Roku, or the like would be any less chatty than the integrated processing in a smart TV. So you need a TV

I am skeptical that an attachment from Google, Amazon, Roku, or the like would be any less chatty than the integrated processing in a smart TV. So you need a TV that connects by HDMI to an HTPC with software you trust running on it, if you're going to distrust stuff.