The Dollars group allows anyone to join them via invitation. The person is then in possession of the organization’s main site password. Due to the nature of the band, being colorless and a carefree group, there is no connection between the members.

That quote is like 15 years old now when you think about it, since the novel was released that is.

The only difference from our universe's Dollars counterpart is that anyone could join even without being invited, and connection between members are blatantly apparent when you put it on your bio or were publicly listed as mutual friends on social media.