FYI to others. I appear to have received an update to my Nvidia Shield (2017) today to version 8.2 of Android TV. This has resulted in 85% of my home screen being turned into adverts for Disney+ (app not even installed) and a big turd button demanding that I customise channels.
It appears that this has been coming for a while, I have been blissfully ignorant of it until today:
So this is a just a bit of a rant really, going to have to re-evaluate things. I feel this is egregious and something that I am happy to expend a lot of effort to rid myself off, might have to replace the launcher. I am outraged.