We are digital librarians. Among us are represented the various reasons to keep data -- legal requirements, competitive requirements, uncertainty of permanence of cloud services, distaste for transmitting your data externally (e.g. government or corporate espionage), cultural and familial archivists, internet collapse preppers, and people who do it themselves so they're sure it's done right. Everyone has their reasons for curating the data they have decided to keep (either forever or For A Damn Long Time (tm) ). Along the way we have sought out like-minded individuals to exchange strategies, war stories, and cautionary tales of failures.
Yes. These hardware devices are called "computers". They run software that use the Gutmann algorithm to erase the contents of a hdd.
Today hdds are more likely to be physically shredded in order to destroy the data on them. Faster and less labor intensive and less likely to be used wrong.
I'm sure you can find some Chinese company selling them, but there's no point: the Gutmann method is designed for hardware that hasn't been made in the past 30 years. With modern hardware, a simple zero-wipe will stop anyone short of a three-letter agency, and even waving a degaussing wand over it will stop most attackers.