Earlier quoted context omitted.
Ads over time extract profit margins from all other industries. For example at least 50% of all profits from mobile games are spent on acquiring users from ads.
Do you have a source on that? I'm not challenging, I believe it, I just wanna see some proof
Do a thought experiment and you'll find a nugget of truth to the idea. Imagine two competitors who are otherwise identical. What would their AdWords buying strategy be?