"[...] Linus moved to it and most of the developers followed. They stayed in it for three more years before moving to Git because BitKeeper wasn't open source."
Glosses over things, but is essentially accurate. Lots of people were not willing to use a proprietary tool, which prompted some reverse-engineering, which caused BK to withdraw their offer.
If all free software activists had accepted the compromise of using the free-as-in-beer BK, git would never have been created.
Um, the "because" part is not quite right.