I got an apple tv 4K and factory reset my tv. never updated the tv or allowed it online after that. i use the plex app and jellyfin for local network files. it also has VLC from the app store for free. apple isn't everyone's cup of tea, but they don't embed ads in the app interface. also, the ATV has a huge mute button, one of my favorite features.

as far as disabling the android crap, I went through every single menu setting and turned off all of the nagging "features" like auto update, bravia notifications, sign in, anythin android, etc. it acts almost entirely like a dumb tv in that way now. very relieved after spending $$$ on a TV and fearing the forced ads. good luck, hope this helps.