While the article talks about Adsense fraud, there's a ton of fraud happening on Adwords as well like competitors or bots that click on your ads to deplete your ad budget. Google provides refunds for some of those fraudulent clicks as well.

I'm a developer at https://www.clickcease.com/ a company that's been fighting click fraud for the past few years. If you're affected by click fraud, we can detect fraudulent ad clicks and automatically file refund claims with Google.