Windows Phone is still lacking an official YouTube application, but thankfully there's Metrotube to fill the void. Due to being a rare example of a YouTube player in the Windows Phone app store, the application has become quite popular, which has allowed the developer, named Lazyworm Applications, to think about expanding its business. The result of this is Metrotube for Windows 8, which is said to be coming within two weeks.
While users don't really need a separate program to watch YouTube on Windows 8, they might appreciate to more appealing interface of the client program, as opposed to the regular web version. The application will be available for free and will have an in-app option allowing the user to make a donation. That seems to be the only way for the developer to make money from the application, since there won't be any ads accompanying the experience.