I didn't know that. Thanks for the correction.

That's not my only reason for preferring EC2 for lots of short-lived servers. I left out some anecdotes.

Four months ago, one of my coworkers booted 12 cloud servers in DFW. I later discovered that 3 of them were on the same physical hardware. Two months ago, about 55 of 60 servers actually came up in ORD. Others were inaccesible or hung. Not even hard reboots helped. We had to kill them and start new ones.

I've had a total of 2 EC2 instances die on me. I admit my usage of the two providers is quite different. The stuff on EC2 is shorter-lived. But I'm pretty sure that high turnover on other providers would cause a lot more grief.