I've never worked for a FAANG, but every place I've worked made it a discretionary thing. I would agree that if the other job was literally "I'd like to flip burgers on the weekend," then the Facebooks of the world should not be able to tell you no, and I guess I'd be surprised if they tried. Working with Burger King as a software developer to build a new social engagement app though, yes.
I also think if you're employed by Facebook as a software developer, and you need to work at Burger King to get extra money, then something else is wrong. Of course you should be able to do what you want with your time but... really?
I've never worked for a FAANG, but every place I've worked made it a discretionary thing. I would agree that if the other job was literally "I'd like to flip burgers on the weekend," then the Facebooks of the world should not be able to tell you no, and I guess I'd be surprised if they tried. Working with Burger King as a software developer to build a new social engagement app though, yes.
I also think if you're employed by Facebook as a software developer, and you need to work at Burger King to get extra money, then something else is wrong. Of course you should be able to do what you want with your time but... really?