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Ha!
Oh god I hope its not a bad omen. The bb area does seem remarkably clean and free of any obvious knarling, so I hope the previous owner wasn't that guy
....or maybe the dogfang thing was doing its thing and saving the day, cos its ace #marketing
It's the kind of thing someone adds after many, many failed attempts to setup your derailleur to not drop the chain on certain shifts. I would view it as a warning about your future.