Google does not provide detailed figures for YouTube's running costs, and YouTube's revenues in 2007 were noted as "not material" in a regulatory filing.[279] In June 2008, a Forbes magazine article projected the 2008 revenue at $200 million, noting progress in advertising sales.[280] In January 2012, it was estimated that visitors to YouTube spent an average of 15 minutes a day on the site, in contrast to the four or five hours a day spent by a typical US citizen watching television.[28] In 2012, YouTube's revenue from its ads program was estimated at $3.7 billion.[281] In 2013 it nearly doubled and estimated to hit $5.6 billion according to eMarketer,[281][282][283] while others estimated $4.7 billion.[281] The vast majority of videos on YouTube are free to view and supported by advertising.[56] In May 2013, YouTube introduced a trial scheme of 53 subscription channels with prices ranging from $0.99 to $6.99 a month.[284] The move was seen as an attempt to compete with other providers of online subscription services such as Netflix and Hulu.[56] In 2017, viewers on average watch YouTube on mobile devices for more than an hour every day.[285]

Making a lot of money on YouTube is not as easy as you might think. There are a lot of hurdles to overcome in the process. It's definitely not a way to get rich quick. However, if you have a hobby, are really good at a particular activity and would like to help people, are funny, or even if you just want to have some fun, YouTube is a great option to cash in some extra bucks doing something you love.
What kind of sales multiple does this fast-growing video juggernaut deserve? It's tough to think of a direct comparison. Netflix, which trades for over eight times its 2018 revenue consensus, relies on subscription revenue rather than ads. And whereas YouTube largely relies on ad revenue-sharing deals with content partners, Netflix directly pays its content partners for their material.
To be clear, it’s hard to make videos that very young children can learn from. (Johnson’s doctoral adviser, Georgene Troseth, was part of the team that demonstrated this.) Children under 2 struggle to translate the world of the screen to the one they see around them, with all its complexity and three-dimensionality. That’s why things like Baby Einstein have been debunked as educational tools. Most important for kids under 2 is rich interaction with humans and their actual environments. Older toddlers are the ones who can get something truly educational from videos, as opposed to just entertainment and the killing of time.
YouTube's policies on "advertiser-friendly content" restrict what may be incorporated into videos being monetized; this includes strong violence, language, sexual content, and "controversial or sensitive subjects and events, including subjects related to war, political conflicts, natural disasters and tragedies, even if graphic imagery is not shown", unless the content is "usually newsworthy or comedic and the creator's intent is to inform or entertain".[352] In September 2016, after introducing an enhanced notification system to inform users of these violations, YouTube's policies were criticized by prominent users, including Phillip DeFranco and Vlogbrothers. DeFranco argued that not being able to earn advertising revenue on such videos was "censorship by a different name". A YouTube spokesperson stated that while the policy itself was not new, the service had "improved the notification and appeal process to ensure better communication to our creators".[353][354][355]
But what about the cost of servers, bandwith etc? I think it might be in the range of  $750 million per year to as high as $1.5 Bn plus ( we will never know as Google never reveals cost of running youtube, and Google has invested heavily in this space ). I feel Youtube as a standalone business  MAY NOT be as profitable a biz as Search and might never be since barely 10% of its content is actually monetizable. But for Google, with $30 Billion revenues, Youtube losses( even if money lost is as high as say $500 million per year) is chump change considering the strategic advantage it gives visavis competition. (Microsoft online businesses lost way more last 10 years). Youtube subsidy by Google has created a monopoly which has effectively destroyed all independent video ad network business plans.
YouTube allows users to upload, view, rate, share, add to favorites, report, comment on videos, and subscribe to other users. It offers a wide variety of user-generated and corporate media videos. Available content includes video clips, TV show clips, music videos, short and documentary films, audio recordings, movie trailers, live streams, and other content such as video blogging, short original videos, and educational videos. Most of the content on YouTube is uploaded by individuals, but media corporations including CBS, the BBC, Vevo, and Hulu offer some of their material via YouTube as part of the YouTube partnership program. Unregistered users can only watch videos on the site, while registered users are permitted to upload an unlimited number of videos and add comments to videos. Videos deemed potentially inappropriate are available only to registered users affirming themselves to be at least 18 years old.