From what I understand, they basically have a very open work structure. People are free to work on what they want, when they want. They actually are against high workloads and do everything they can to prevent employee burnout.
I can’t say if that extends beyond the development teams to other departments like server management, but everything I’ve ever seen about them says they’re all just in it to have fun, make cool shit now and then, and of course make tons of money. The fact that their sales platform basically just prints money helps support that culture, obviously.