This keeps happening repeatedly - so let there be no more startups offering missing features of EC2. Go back! Build something else! Amazon has made it clear that you should not build a general cloud offering on top of EC2 - it must be niche, or not an enhancement of their offering, or they will simply do the same thing and kill you. And I don't think its that they're copying anyone. They've given lots of notice. Its just that their product vision fits with most anyone's who looks at what EC2 is missing.