Of course as a practical matter the block only applies to an account rather a person, but it makes the point to the person that the vandalism isn't welcome.
I mostly mean to expand on how OSM deals with such things, not to argue whether or not that makes it suitable for your purposes.
http://www.openstreetmap.org/node/1698922081/history
http://www.openstreetmap.org/user_blocks/1652
Of course as a practical matter the block only applies to an account rather a person, but it makes the point to the person that the vandalism isn't welcome.
I mostly mean to expand on how OSM deals with such things, not to argue whether or not that makes it suitable for your purposes.