Doesn't the same condition apply to AWS, only they're called "availability zones?"

You hit it on the head. Weave Net is participating in the Istio project. I hope they can bring WeaveNet to Istio. That might be able to provide a multi cloud vendor service mesh.

But that’s easily possible – you can use all the French hosters at once. Latency between them is practically nil because their data centers are only a few hundred meters away from each other.

Sure, in case all of Paris goes down, you’re down, too. But in day-to-day usage you can have good reliability on a shoestring budget.