legalization of graffiti

what if there was an international independent organization for the protection of graffiti artists and their works, which would stamp its stamp on really cool pieces and thereby create protection from their damage, that is, it was possible to sue for their damage etc, of course, before that it is necessary to legalize graffiti and create a law. for example, you can paint over the ends of buildings and the exterior of garages, certain fences etc.