There's an unexpectedly large number of commenters who seem to think that this falls under free speech. Do I need to explain that the crap these ads usually download when clicked is responsible for a ton of support calls, many of which go to innocent kids on weekends just trying to unwind from school? :)

I'm kidding of course but seriously comparing blocking these buttons and deceptive elements is not censorship, it's Google saying to these publishers that if they don't get their shit together, that they will dissuade traffic from visiting their sites. The only way to get the attention of bigger publishing companies is to grab them by the revenue stream, you all know this.