https://www.techdirt.com/articles/20210120/15455246090/content-moderation-case-study-using-hashes-scanning-to-stop-cloud-storage-being-used-infringement-2014.shtml

Summary: Since the rise of the internet, the recording industry has been particularly concerned about how the internet can and will be used to share infringing content. Over time, the focus of that concern has shifted as the technology (as well as copyright laws) have shifted. In the early 2000s, most of the concern was around file sharing applications, services and sites, such as Napster, Limewire, and The Pirate Bay. However, after 2010, much of the emphasis switched to so-called “cyberlockers.”

Unlike file sharing apps, that involved person-to-person sharing directly from their own computers via intermediary technologies, a cyberlocker was more of a hard drive on the internet. The issue was that some would store large quantities of music files, and then make them available for unlicensed downloading.