I mean, the opposite is also true, isn't it? If Google's search ad revenue was going down while YouTube ad revenue was going up, I feel like Google would want t

I mean, the opposite is also true, isn't it? If Google's search ad revenue was going down while YouTube ad revenue was going up, I feel like Google would want to keep that a secret so that people don't realize that search ads are shrinking in relevance. Basically, I don't see that Google has any incentive to break out its profits by line of business unless someone forces them to. They're better off if you just look at a black box of ad revenue and say "yeah it's all profitable, so ads are as strong as ever."