If you have 40M users I suspect the annual cost from the registrar is very small part of the budget. Get a registrar where you don't have to deal with a phone operator.
I work in this industry and it's a very clear separation between bulk registrars and those that maintain fewer but high value domain names. The latter usually give you a personal contact person to call and work proactively to deal with threats to companies' domain names and trade marks. I don't think I have ever heard of a domain being abruptly suspended by such a registrar.
The cost is usually 5x-10x that of the cheapest registrars so there is naturally a balance to be struck, and as I work in this industry I might be a bit biased. However the damage when waiting on the TTL when registries update NS records sounds very substantial when they first suspend and later restore a domain name in what sound as a very reckless behavior.
I work in this industry and it's a very clear separation between bulk registrars and those that maintain fewer but high value domain names. The latter usually give you a personal contact person to call and work proactively to deal with threats to companies' domain names and trade marks. I don't think I have ever heard of a domain being abruptly suspended by such a registrar.
The cost is usually 5x-10x that of the cheapest registrars so there is naturally a balance to be struck, and as I work in this industry I might be a bit biased. However the damage when waiting on the TTL when registries update NS records sounds very substantial when they first suspend and later restore a domain name in what sound as a very reckless behavior.