About a week ago, I tried to convert a Youtube video on Online-Convert, only to discover Youtube conversion was not supported. Tried to research why it was stopped, and discovered it was due to a letter Google sent to major Youtube-affiliated conversion sites, threatening legal action if the service was not stopped. Two days ago, I tried using Google Search on my mobile and was faced with Captcha. Reason? According to them, it's to prevent automated requests by a robot.
Is Google planning something massive? Why disrupt thousands of Google-affiliated websites?

i noticed same when i checked out www.youtube-mp3.org . i think Google is ensuring some strictly measures to protect their brand. it doesn't stop us either way from downloading and converting youtube videos.