To Rhizomes point: Yes, it's relatively easy to re-point them to somewhere else.. and if your business can tolerate the interruption that's fine. Those change

To Rhizomes point: Yes, it's relatively easy to re-point them to somewhere else.. and if your business can tolerate the interruption that's fine. Those changes, though, take time to cache out, and depending on your registrar's procedures and whatnot, you could be looking at hours or a couple of days to get things to stabilize back to normal; not to mention finding a new provider and getting things set up. You'll need ot make sure you have the zone data on hand ready to get set up with a new provider, and so on. You could have a procedure in place to do this, sure, with everything tested and validated, but at that point it's much easier to just have a DNS provider of the proper class who can handle these things for you. And keep in mind, if it's your domain they are trying to shut down, and not your DNS provider specifically, the attack will very likely just follow the change, leaving you in quite a mess. So the short answer: self-host if it's not revenue impacting. If there is money at stake, spend a little bit for a top-notch provider.