They’re basically trying to find the time to create duplicate UUIDs. UUIDs are randomly generated and assumed to be so unique and actually random across… well, everything, that no one even checks if they’re actually unique. They suggested they found one in 5 hours. The only maybe possible way I could think of to do this legitimately is to use some ridiculously powerful computer and still get very lucky.

I actually use it for creating thumbnails for a sorta niche application. The resulting files are quite small and the quality is fine. I do remember it being a pain in the ass to deal with ~10 years ago.