It seems Larry McVoy of BitMover is either a complete asshole or just your run of the mill socially inept paranoid hacker. He is actively reaching out to customers to have their employees stop working on competing open source to bitkeeper. These people aren't BitKeeper developers, they're end users. It's like if Microsoft tried preventing Word users from contributing source to Open Office. Simply, insane. Lesson learned: Avoid BitKeeper at all costs.