Yes, that hosting center was unsafe as hell. All of OVH's early year featured a lot of duct-tape and daring corner-cutting - that is how they were incredibly cheap. But nowadays they are just as mainstream industrial as their competitors and the 2021 fire marked the end of an era... It is sad that it happened as they were already turning the company around to being an established player.

A great writeup of the incident and its context, three years afterwards: https://www.datacenterdynamics.com/en/analysis/ovhcloud-fire...