EDIT:
So according to this thread, this is a Google related change and not Nvidia?
In which case, similar to the banner issue from a previous update, you can get a different launcher (see comments for FLauncher) to avoid it
https://www.reddit.com/r/ShieldAndroidTV/comments/181vh4t/ads_at_full_screen/
Would a pihole or something like adguars dns that stops ads be a good solution to this? Or would I be stuck with just full screen black screen?
Depends on how they do it I guess
I remember reading about the newer home screen added a promotional banner. It was showing content from the apps themselves (ex. New shows from Disney+) but it was still annoying and a lot of people switched to a different launcher.
People will probably figure something out
edit: see the comment by @looping@jlai.lu
That’s a good point. I didn’t notice but have a ton of ads now from Disney etc…I’ll try flauncher