When Big Brands Stopped Spending On Digital Ads, Nothing Happened. Why?

Big brands turned off millions of dollars of digital ad spending, and saw no change in business outcomes. Small businesses tuned their digital marketing and reduced the number of ad impressions, clicks, and traffic to their sites, but saw business activity go up, instead of down. What the heck is going on?

Digital marketing works; but the vast majority of impressions and clicks are from bot activity currently.