As long as you keep it off the internet. Otherwise it’s absolute loaded with adverts everywhere.

You can replace the Android TV launcher with an alternative like Projectivy [1] to get rid of whatever nonsense the stock launcher tries to push. Add Flicky [2] to address F-Droid and you've got a nuisance-free Android TV.

[1] https://github.com/spocky/miproja1

[2] https://github.com/mlm-games/flicky