[kevin_nisbet]

Managing on-prem hardware may not necessarily be hard, but it can be extremely time consuming. To me, the nice thing about dropping a bunch of hardware in a colo is you get to take a lot of shortcuts and take risks that you cannot buy from the public cloud providers.

I worked for a company and would do it again that did the colo route, and it gave immense cost savings compared to public cloud, taking on risks that you can't do elsewhere. Before they started investing in having folks take care of the infra as a raw startup, it was just some servers and some desktop unmanaged switches. But that gave the company breathing room to survive as the business model probably didn't work without it. But also had a reputation for unreliable service.

I've also built the five nines infra at telcos, and yes you can do it with average engineers, but it's going to be time consuming, slow, and expensive in costs and labor. To allow 26 seconds of unplanned outage a month, you're going to be testing every firmware update for every piece of equipment on an ongoing basis, and practicing every operation and change as best as possible. And you need the scale that you get that 26s by having most outages only impact a subset of your customer base, otherwise you're going to blow that outage budget fast.