We've seen lots of Google smackdowns over the last five years...first there was Panda in 2011, then Penguin in early 2012...since then, there have been a number of smaller algorithm changes.
Last week, we saw a Penguin "update" which targeted spam links and junk websites. On this one, I say more power to them for taking out the trash!
Google is trying to make everyone play by the rules, and where there are rules, there are always rule-breakers! However, we need to keep in mind that
"He who has the gold makes the rules."