We had been using AdSense for 10 years and had our account disabled after a competitor used a bot to click on the ads 10k+ times. This particular individual messaged me after doing so and bragged about how our account would be banned.
We forwarded the message to Google, asked them to remove those clicks, and told them we took measures to prevent this individual from doing it again. The next month, we were banned by Google on pay day. We appealed and got an automated denial. When we tried to get information from our Google contacts, we were told to make sure our family wasn't clicking on the ads.
Fortunately, we weren't reliant on AdSense, but it was insulting to be treated like children by this company. I'm glad that I won't have to deal with such an unethical company again, at least until they randomly disable my Google account.
So, to sum up this blog post: your competitors can spend a couple bucks to shut you down permanently, and Google will treat you like a child.