There is a popular saying about ads and Google that if ads are a bubble then so is Google. Google’s maximum revenue comes from advertisements . Infact 90% of their income is due to ads. Google has tasted success when dealing with ads and this time they placed ads on YouTube.
You might think that YouTube already hosts quite a few ads on the top right corner of the browser, which is quite true. But now in some videos , a Google Ad will play before the actual video. After the ad , the video will be played as normal.
Though Google claims to keep ads and content separate but this time the concept went haywire.The better part being that it does not play third party ads. For example : While watching an ad related to the Oscars, a Google Chrome ad was played before the video and then came in the video ( Sandra Bullock Interview ) .
Guess this was just an experiment by Google and not a permanent feature.