Don't know about OVH (it might be a very similar story?) but Hetzner is from my region and I've known the brand since back in the 1990ies. The difference to most (all?) large American hosting services is that they never went through some big investment scale-up of the type "spend now to earn later" where costs just don't matter as long as there is some growth to handwave it away, but have come to where they are now through continuous bootstrapping. The same applies to hundreds of much smaller hosters, but few (none?) reach anywhere close to Hetzner's economy of scale.