Free accounts come with 100 MB of space and the ability to import audio/visual content from youtube, Vimeo, Soundcloud, and Flickr. You can, therefore, have an almost limitless supply of content that doesn't take up space or bandwidth on our server (it doesn't cost us money).
However, if you would like to have more space and native audio/visual support, those features can be turned on for you. That will also give you the ability to make playlists of that content.
Our players are commercial free, mobile compatible, sharable, and not subject to removal by youtube or other entities, content just has to meet the guidelines in our Terms of Service.