I’ve been wishing they’d sell that NBC crap for years, but it actually does make money.
It’s a relic they acquired when they bought RCA.
Interestingly, the NBC “chimes” are the notes “G-E-C”. They were originally written for GE, but when GE let the rights lapse, RCA acquired them for their then-radio network. When GE swallowed RCA, they got their chimes back after all those years.