They're using this now, but I imagine the user ValleZ's comment is about a past time working at Uber or hearing stories from Uber developer friends, in which I

They're using this now, but I imagine the user ValleZ's comment is about a past time working at Uber or hearing stories from Uber developer friends, in which I can see why spinning up a low-latency (but still over 30+ millisecond RTT) virtual machine would be an early solution to developers trying to cut down on build times and whatnot.