The author spent $220 on Google app ads and found that 60% of the installs were from bots, with 33 out of 56 installs showing a pattern of fake traffic. The bots installed an old version of the app, opened it once, and never came back, making it difficult to detect the fake installs. The author suspects a bot farm was behind the fake installs and is waiting for Google's response to an invalid-traffic form. The author has since changed the ad campaign's goal to 'won a puzzle' to make it harder for bots to fake interactions.