I can conceive of a scenario where every instance of a particular IOT device receives a unique domain name in the same way it receives a MAC address and unique serial number; the domain name could in fact be its serial number. That would be a legit example for bulk acquisition of domain names.
Of course every device has its own name, but nobody in their right mind would buy them one at a time from a TLD registry. For a whole lot of domain names, see https://wild.web.sp.am, click on a few links, and look at the domain names. If you followed the links long enough you'd find roughly 2 billion different names. Regards, John Levine, john.levine@standcore.com Standcore LLC PS: When I first set up that site, it broke the Bingbot. After alerting one of your colleagues to the problem, who told me that it led to some very loud conversations down the hall, Bing now knows enough to stay away but I have a log file with 6 million entries from people who don't.