Effectively, only 30% (!) of the surface are used for displaying content. What an utter disgrace. And the data volume that is wasted for all of this nonsense...

There's a reason why mobile ads are so much more expensive - it is extremely hard to block them. Chrome and AOSP webkit don't support any kind of adblocking plugins, and editing /etc/hosts requires rooting (which gets ever harder and harder) or weird VPN/fake VPN solutions that have their own massive security and battery life implications.