I don’t know why this is such a difficult thing for people to understand, but Blackbeard was the famous pirate. Bluebeard was just a serial murderer of wives. I’m not sure why either murderous criminal would be considered a good corporate symbol. But if, for instance, a company that sells hair care products wanted to use Bluebeard as a mascot, going for some kind of jolly roger motif is way off base. Bluebeard’s whole thing was keys, so might I suggest his use by a lock manufacturer?
At least Edward Teach had a certain amount of flair (come to think of it, a beard products company that had Blackbeard as their mascot could try to bring back his striking fashion statement of wearing a bunch of lighted slow-burning matches in his beard – it’s hard to find beard matches these days).