This might be better understood as a social concept rather than a legal one. Suppose you have a social group, and the way people are admitted into it is by invi

This might be better understood as a social concept rather than a legal one. Suppose you have a social group, and the way people are admitted into it is by invitations. The GPL is someone who will invite anyone who asks, as long as they themselves will also commit to inviting anyone who asks. That is, anyone who is invited by the GPL person cannot discriminate about who else they admit to the group. The BSD is someone who will invite anyone who asks, and they can be as cliquey as they like. They can discriminate on any basis, or form in-groups among themselves where other people are not permitted. Does the first or the second social group seem better to you? This might be a good predictor of whether the GPL or BSD model is more intuitive.