I believe there is a problem/conflict with the networked-software clause and the EUPL's compatibility clause. It allows anyone to fork a project under the GPL license. When someone makes a fork of an EUPL project under the GPL license, they are then bypassing the extra conditions set out in the AGPL. I believe this to be a mistake/loophole in the EUPL. But I am not a lawyer so I really hope an actual legal expert can weigh in on this.