Why is AGPL toxic? I'd advise all developers to do dual AGPL/commercial license for all their open source projects. AGPL would guarantee that their work is not

Why is AGPL toxic? I'd advise all developers to do dual AGPL/commercial license for all their open source projects. AGPL would guarantee that their work is not used by others without giving back anything; commercial one to keep them afloat and allow proper business.