Google change their search criteria all the time. With more people now searching on their phones than on PCs, Google brought in a big new rule on April 21st: If your website isn’t mobile-friendly, you’ll suffer in search results.
I ran this site you’re on now through Google’s mobile test… yeah, I already knew what it would do.
Tiny hard to read text, miniscule hard to click links, and the background image mysteriously gave up.