[s1artibartfast]

Yes, but that is pretty terrible advice.

It might make sense if you have tons of profitable business options and you have to choose one, but that is rarely the situation.

There are billion dollar companies that run on AdWords, and the owners are far better off than if they refused to run a business with a single point failure, and worked at a coffee shop.

Hundreds of billions of dollars flow through AdWords to businesses that would NOT be better off without the revenue.

[godshatter]

And if all these Google-dependent companies had diversified a bit, put some money in other ad networks as they grew (even if small amounts), then maybe Google wouldn't dominate all ad revenue. But that would require leaving a small amount of money on the table, so nope, I guess.