For various reasons related to our Prosper202 trademark, we ask if you're going to start a site about Prosper202 or related to it that you not use "Prosper202" in the domain name. Try using "P202" instead, or another variation. We're not lawyers, but very good ones tell us we have to do this to preserve our trademark. Also many users have told us they find it confusing.
If you already have a domain with "Prosper202" in it, redirecting it to the "P202" equivilent is fine, just as long as the main one users see and you promote doesn't contain "Prosper202."
"Prosper202" in sub-domains is fine, like Prosper202.example.com, we're just concerned about top-level domains.
We've told this to anyone who has ever asked us, we just wanted to make it public so more people could be aware of this policy.