I do not have much sympathy for him. Either he believes in Free Opensource Software licensing that is available to anyone for any use, or he doesn't. He can't have it both ways.
If he wants to be paid for his work, he should get off his fanny and go find a corporate sponsor. That's on him, and no one else.
Otherwise, my only response to him is: "FOSS doesn't need you or your attitude. It is counterproductive and does more harm than good for other projects beyond you. Someone else will contribute to the project. He's welcome to leave and take his drama with him.
Do not let the door hit you in the fanny on the way out. "