[ChuckMcM]

somewhere between $250K - $400K a month seems to be the thoughts of various open sources on the matter. That would put it in the $3 - $5 million per year at its peak. Assuming their play took a while to ramp up maybe $25 million total?

Google makes more than $25B/year in revenue so even with a 30/70 payout (30 percent to the fraudsters) maybe .001% of Google's ad revenue?

And that is why people do this stuff. Other than getting booted off the store nothing else will happen to these people who just made tens of millions of dollars.