I really don't understand why any enterprise service would use these kinds of bargain bin registrars. Is using a reputable registrar with professional, enterprise-grade service not worth it given the scale of someone like Zoho? Optimizing to save a tiny amount on your registrar while you have millions pouring in from customers seems like a really poor decision.
I really believe in running a lean business, but running lean means cutting the fat, not cutting out your muscles and tendons and running with a naked skeleton that is fragile.