Probably they're thinking "This person brought us something that is about to be extinct, our job is to keep things from going extinct."

The entirety of IA is the idea that culture and history are to be preserved for future generations. The job of these big companies like UMG is to make as much money as possible, and destroying history eliminates a core competitor, themselves. IA's existence is poking the bear (just look at how often the Web Archive's existence is used by others to show off back actors in companies). Compromise left a long time ago.