What the others have said as well the pressure of public opinion. The effects of the strike may not be felt for months but if musical artists start cancelling shows, this is going to effect the fans now. The public outrage towards execs and companies can be very persuasive.
Snoop Dogg shows support for striking actors by canceling 'Doggystyle' concerts ( thegrio.com )
The "Snoop Dogg & Friends: 30th Anniversary of Doggystyle" concerts have been canceled in support of the WGA and SAG/AFTRA strikes.
I think the rich need a reminder... ( lemmy.world )