I interpreted this as: "don't think you can reasonably host" => I encourage our competitors to do this "general-purpose applications on a multi-tenant basis"

I interpreted this as: "don't think you can reasonably host" => I encourage our competitors to do this "general-purpose applications on a multi-tenant basis" => any program a black hat who signed up with our automated system wants to run, next to all the other programs random people want to run "on shared hardware" => one lump of iron owned by Fly "using container systems" => containers vs VMs, in this case, and especially a VM manager that pays some attention to security.