It's a great thing for startups that OVH provides servers at such an amazing low cost. Yes, there is always a risk that someone will make a mistake in the building design. There's a chance that eliminating some redundancies increases the possibility of a failure. There's always a chance that something bad will go wrong.

However, this isn't just a matter of Hanlon's razor (incompetence vs malice), but more of a matter of an intelligent guesstimate of risk versus a lack of knowledge in some areas (wasn't this OVH's very first datacenter?), and a strong focus on reducing costs. Perhaps the latter went too far, and definitely some obvious mistakes were made by not having a universal power cut off of some sort, but dealing with the amount of power on tap in a datacenter is always dangerous, even when there is no fire at all.

I'm not saying we need to give OVH a complete pass on this. I'm just saying that there are a lot of extenuating circumstances and, except for the power cut off, it's not clear that OVH made any choices due to extreme negligence or cost-cutting. In other words, they didn't do anything immoral. At worst, it appears that (even from the most anti-OVH party here), this was just a mistake in the design of a new (at the time) style of datacenter, and it did work properly for many years before there was a problem. Making a mistake is not immoral.