There's an old saying that you can learn a lot about a magazine's readership by looking at its ads. I suspect that this is also true for many websites.
No doubt Google must have some standards for the ads it shows on its search results page. But after doing some checking, I wonder how high those standards are. Here are the headlines of some adwords ads that I found in just a few minutes of looking:
Make Money Online Fast
Get Paid $145 Per Survey
Turn $100s Into $1,000s
Quick Tip To Lose Weight
10 Best Weight Loss Pills
Baking Soda Cancer Remedy
Holistic Cancer Center
Shocking Celebrity Secrets We Can't Believe
Lonely Women Nearby
Pretty Ukraine Ladies
Random Naughty Hook Ups
I've read that Google's ad revenue has been increasing steadily for many years. I wonder if these types of ads are some of their biggest money-makers.