I have a slew of classmates working right now in the tech industry at those very same companies that you list. Very few of them order delivery because:

1) their companies provide FREE or heavily subsidized meals for them in the workplace. They aren't going to be ordering crappy delivery when they can get chef-quality food for FREE; and

2) they make so much money that they aren't going to eat at home on the couch after work. Most of them just go out with their friends after work and run up huge bills because they make serious coin.

Tech Bros in their 20s with tons of disposable income aren't going home after work to watch Netflix while eating delivery on the couch.