Perfectly willing to admit I'm wrong if and when that time comes. At this point, that's my theory.
Bare metal works when your workload is well-defined and understood. Then you can actually put reasonable estimates for what you need and hire/purchase infra accordingly.
The balance here is tricky. Based on public data, it seems that Netflix has ~$16B in revenue against $300m/yr cloud spend. 2% seems much more reasonable to me.
I feel like a drive toward efficiency is a worthwhile endeavor for a startup in terms of establishing a competitive advantage.