I was really disappointed to find the same problems with tvOS having moved from a pair of Shields.
The ads hadn’t rolled out yet on Shield when I moved over but for some reason I just assumed Apple wouldn’t be shilling ads at me constantly for services I don’t have, or trying to sell me content I already have access to.
More fool me. Fire TV is worse, but I’ve heard Roku is much the same.
The Smart TV ecosystem is rot all over.