5) Is back hawking a new business venture in this community despite there being unresolved issues surrounding his past ventures. If the point of the scammer tag is to warn people against dealing with those who have an unsatisfactory record when it comes to meeting their obligations, then this is exactly the kind of situation in which it can be useful.
It does seem like a good idea to clearly have it stated somewhere that he has left all his previous ventures hanging with bitcoins still in limbo since he is now trying to get people to come to his new business and they ought to know going in that he has a very checkered past.
The only way I know myself is because I have been carefully following the goings on surrounding this community so that I myself am not caught unaware by someone like Usagi but that is quite a high burden to place on most people and anyone who was not around before he deleted his posts will find it more difficult to put it together.