Over on Bitcoin Stack Exchange we recently had a minor self-promotion issue with a user. Nothing new or special there, except that the user's profile name is MtGox, the name of the biggest Bitcoin exchange, and that user is explicitly astro-turfing a shady-looking service in the same vein as MtGox's legitimate business.
This specific instance probably isn't a big deal, this user is fairly obviously here to spam/turf and not to contribute so following SOP they'll probably end up banned/burned/whatever anyway, but I'm curious about precedent.
My understanding is that so long as no one shows up threatening legal action and they're not totally offensive, usernames and about pages are more or less free rein, but what about potentially fraudulent impersonation of legitimate entities, which especially poses a serious threat on sites like Bitcoin.SE and Money.SE where such fraud or impersonation could end up having serious financial consequences for our communities.
Is there already a policy in place for this sort of thing? I feel like burning this account is the right thing to do to keep my users safe, but I also feel like it's a risky precedent to set...