I think you mention the real reason as a footnote. Ads are SO lucrative that it isn't worth it to be innovative or take huge risks. They do a little here and th

I think you mention the real reason as a footnote. Ads are SO lucrative that it isn't worth it to be innovative or take huge risks. They do a little here and there but why invest $10B in an idea that is unlikely to have higher margins or larger volume.