For the AGPL, why isn't the GPL sufficient to turn the copyright regime on its head and neutralize copyright? Or do the people who release under the AGPL want

For the AGPL, why isn't the GPL sufficient to turn the copyright regime on its head and neutralize copyright? Or do the people who release under the AGPL want something beyond what the GPL provides? And if that is the case, what can they use to get it other than the rights granted by copyright? Surely they could use something other than copyright to get that if it was possible.