The coins main purpose is to be used in a bounty system to entice pirate groups to upload new content and content not yet added in different quality and subtitles. It is all speculation at this point as it hasn't been added into the site yet but it is supposed to be with the next two weeks.
But you said earlier that purevidz was moderated so why would pirates upload stuff only to have it removed? It sounds like the fork dev has the right idea. Unmoderated and free for all.
I brought this up on the discord chat. What I mean by moderating is that they can control what is uploaded. This does not mean pirated movies. This means that you can control people from taking advantage of a streaming system for illegal content such as child porn. Talking to the dev of the new system, even he said the only way to prevent that stuff is by an opt in. Meaning that people can still use it for those purposes and it is up to the user if they want to view that content or not. Purevidz doesn't have to worry about that being a part of their system as it is moderated.