The DVD screensaver was perfect: unobtrusive and did what it was supposed to do: prevent your CRT screen from burning-in an image. On top of that, it gave you something to look forward to when it would perfectly hit a corner (which some people thought was a myth; sadly the GIF version does not).
Now, any screen in your home is fair game for intrusive ads. Why make something simple, elegant, functional, and unobtrusive when that otherwise idle (or even in-use!) screen can be crammed with ads.
I highly recommend unplugging all network cables from your smartTV, disabling its wifi, and using a cheap PC as a streaming box. Adblockers, media ripping (is possible), it can do more than smart tV, you can play games on it.