Comment by jasonwatkinspdx

Power limitations are a big deal. I haven't shopped for datacenter cages since web 2.0, but even back then it was a significant issue. Lots of places couldn't give you more than a few kw per rack. State of the art servers can be 2kw each, so you start pushing 60kw per rack. Re rigging a decades old data center for that isn't trivial. Remember you need not just the raw power but cooling, backup generator capacity, enough battery to cover the transition, etc.

It's hugely expensive, which is why the big cloud infrastructure companies have spent so much on optimizing every detail they can.