The authors reply to band management was overly long winded when he just needed to stress that he didn’t want his work being used by random commercial uses, and that he offered them 100 to charity.
Instead of that he demanded money to charity from the band itself (!?) and put the strongest emphasis (to my read) seemed to be about his rights. This unnecessarily amplified the aggression, and triggered the band to exercise their rights with the banning.
Everyone within their rights, everyone loses.