Dive summary:

• Google has implemented a change to Top Heavy that penalizes pages with too many advertisements.
• The Top Heavy change will affect 0.7% of English-language searches.
• YouTube's search algorithm change puts emphasis on time spent watching videos and decreases value of clicks.

From the article:

YouTube isn't just changing its algorithm to benefit users -- its changing it to benefit advertisers, too. In the past, when you saw an interesting thumbnail on YouTube and clicked on it, you could have exited out before an ad even began to play, yet that 'click' would still have counted for the video, contributing to higher rankings. With this new change, however, users will need to actually sit through the ads in order for the video to rank higher. ...