Staying away from the politics, anybody who has a business model completely dependent upon a single service’s algorithm should question what kind of business they have.
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.