How do the leaderboards work for songs uploaded from your device?

[Mec]

Are these people bots, or does the game detect you're using the same files and group said people together based on the files? Cause if that's the case, that's pretty cool.

[Sekoree]

Same/Similar files and grouped together, while there might be small differences in track-gen depending on, there are a few checks on general length and closeness of the FFT values extracted from the audiofile