Can Epic Online Services actually do multiplayer?

I know the question sounds like something of an oxymoron, but I can’t find anything that shows that you can play an actual game using EOS. In addition to that, it seems like, for the moment at least, you need to have a product published to the Marketplace before you can get the requisite ID numbers. I must be missing something extremely obvious, but it doesn’t look like EOS is actually usable right now. Can someone help me understand?