So they could have had 100% redundant systems at OVH and still be under half the cost of a traditional "cloud" provider?
I would look at architecture and operations first. Their "main" node went down, and they did not have a way they could just bring another instance of it online fast on a fresh OVH machine (typically provisioned in a few minutes, assuming they had no hot standby). If the same happened to their "main" VM at a "hyperscaler" , I would guess they also would have been up the same creek. It is not the difference between 120 and 600 seconds to provision a new machine that caused their 10 hrs downtime.