Why no go the other direction and make it hard to identify a user, so people do not do it for fame. Open source worked before people were using it as self advertisement.

Might even be good for Microsoft - they would be the only one knowing who is who.

the berne convention copyright defines inalienable authors rights that can not be sold or taken away from the author. the author of any copyright works always has the right to identify themselves with the work, and therefore your suggestion is not legally possible.