Our Persona implementation was done by an engineer from Mozilla's then Persona development team. Wiki was a hard install because it is different than most websites and was also younger code at the time. ⇒ Mozilla Persona
> On November 30th, 2016, Mozilla […] shut down the persona.org services. Persona.org and related domains were taken offline.
We've made it unexpectedly easy to make and claim a site. We have no terms of service, but for claimed sites we have an email so we could alert users of changes such as migration from persona.
Claims can be made for any unclaimed site. I've reversed claims as an administrator, mostly for testing. I've yet to see a malicious claim but without some more administrative control they could become an administrative headache. Nobody wants that.