Originally Posted by st0ned

Single domain license. You don't have to use all 3 of the main features if you do no wish to do so, they are all bundled into 1 for those who wish to offer more to their surfers all in one location. The features don't have to be combined on the same page, they can be added as subdomains or directories on the site, separate from the other features.

Look at it this way, you are getting all 3 for the cost of 1 - you have the option to use them all or in any combination that you wish (or simply just Tube if you wanted).