I know this isn’t purely TV-related, but there used to be a secret menu for Roku where you could disable home screen ads. That stopped working for me several months ago. So I recently bought an Onn box (which is basically Android TV, but had as very cluttered UI) and side-loaded one of the open source launchers onto it. It’s been a much better experience than Roku, not least because there’s are no more home screen ads.
I should clarify: the secret menu can still be navigated to and the options there set. But ads now appear regardless. I went back into the menu and verified the options hadn’t changed (they hadn’t). It’s like Roku has gotten wind of the exploit and ‘fixed’ their OS to ignore those options.