I am confident even Google fails to understand how much of their own business is scams and malware.

This is not merely rhetorical. Nvidia, for example, was caught hard during the first cryptocurrency bust... and the second.

Were they caught hard or did they have a relatively small oversupply after milking the demand for as long as possible?

What's nvidia and crypto mining hardware got to do with Advertising scams? Mining isn't a scam in itself.