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/
Interesting… I have an OG Shield, also in the Netherlands, but have seen no ads (that being said, companies A/B test and do gradual rollout of this kind of BS).
But I also kept my Android Home in the version without ads by disabling Play Store updates and instead manually going over all apps (except Home!) every month or so (or when I have an issue with any app I use).
I feel confident that I’ll be able to hack my way around this new form of ads.