how fundamentally this breaks most capitalist ability to profit off of/exploit/commodify something. practically every kind of capitalist exploitation of art is based, in some way, on writing or recording the art.
art which is only reproduceable directly, person to person, can only really be commercialized by way of recieving payment for performance. you definitely could totally try to exploit art in that way but it's just so much less practical.
easier for them to just ignore the anti-license and write it down anyways.