I'm not a big fan of owning users' passwords, so unless people really really ask for it, we probably won't add a "create login/pass" functionality. Also, there is the concept of reputation - Sponsors that pay their offers as promised will have good reputation. For reputation to mean something, we need to know something about the user, and I believe linking with a social account is our best option for that.
Anyway, talking about FreedomSponsors on GitTip's thread is probably not good for MY reputation here on HackerNews (right? I don't really know, I just signed up). So I'm gonna create a new topic and answer questions there...
Thanks for your insterest!
So if Mozilla's Persona doesn't offer a way for the user to publish some sort of online profile, then we probably won't add it as a primary form of signing up on FS. Linking an existing account to authenticate later is ok. But we do want to make it more difficult to create completely "anonymous" profiles. At least that's our thinking today anyway.