Because, California has declared entertainment industry workers essential... so they operate with a special permit, and they do "get tested regularly", but frankly this is still a bit outrageous.

This is where you can see the politics would be poor project managers. Filming TV shows is certainly not essential but just a nice to have. You can easily have a great life watching fictions that have been filmed a year ago.

A large bored population is a great way to increase civil unrest.

The entertainment industry cannot let people realize we would live happily without its products. They have to keep the stream of shows and films coming so people don't realize that.