[nomdep]

nitpicking: the average bus factor cannot be 1 unless there are as many projects without maintainer as projects with two or more maintainers

…

On second thought, the average bus factor might be less than one

[twobitshifter]

You’re right, on the other hand I’d guess that the median bus factor is 1 and a better metric as this isn’t going to be normally distributed.

[Jensson]

Count only core maintainers and I'd be surprised if it was above one, yeah. Companies ensuring they have no core maintainers by spreading everyone out essentially has a bus factor of 0 all the time, even on new projects.