Hmm... youtube was alredy succesful before Google has bought it.
Google bought them in 2006. Youtube is from 2005 and got its initial funding from investors with the desire to resell asap:
see wikipedia:
In November 2005, venture firm Sequoia Capital invested an initial $3.5 million;[5] additionally, Roelof Botha, partner of the firm and former CEO of PayPal, joined the YouTube board of directors. In April 2006, Sequoia and Artis Capital Management put an additional $8 million into the company, which had experienced hugely popular growth within its first few months.
In 2006 google purchased it for 1.65billion $.
Google wan't control of internet. Youtube had to be purchased.