It's strange OVH uses different authoritative DNS domains based on the region of the purchaser. For example, they provided dns10.ovh.ca and ns10.ovh.ca for the test domain I made to evaluate their service. They don't give Canadians IPv6 for their DNS...
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They also don't let you set a null MX record even if you edit the DNS configuration as a text file. Their validation is overly strict and doesn't permit that valid usage. It's also pretty annoying that it took 18 minutes to provision a domain and over 24 hours for working DNSSEC.
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This was with their own .ovh TLD which has great pricing (€3/year per domain, €2/year for first year).
They charge a tiny bit extra for anycast DNS per domain (€1/year) which only has 4 locations: 1 in Canada, 3 in France. Odd, since they have data centres around the world...
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They also don't offer anything fancy like any kind of automatic load balancing, GeoDNS, etc. at least via the basic domain management.
If they want people to use them as a domain registrar / DNS provider, they really need to do better than the gimmick of a really cheap .ovh TLD.