> why aren't Google, FB, Amazon, Microsoft, Alibaba ... hosting their infrastructure on cloud They are... they are literally the cloud(s) and their biggest cus

> why aren't Google, FB, Amazon, Microsoft, Alibaba ... hosting their infrastructure on cloud They are... they are literally the cloud(s) and their biggest customer. In fact, they are big enough to offer you their ops and expertise for a small fee over baremetal. Many cloud consumers are literally using up the overhead existing in these businesses' hardware that would otherwise be sitting around. It can be done cheaper, sure but not without giving up opportunity time and work you may just not want to deal with. I certainly am over having to manage supplier relationships or having to wake someone I don't know or find difficult to converse with to bounce a router or kick a generator.