The #OGB shaping of the "body" comes from a long history/experience of horizontal activism, where "those who do the work have more say." https://www.noisebridge.net/wiki/Do-ocracy

The #OGB pushes that the bulk of the voice comes from those who run the #Fediverse, the people who run/support the instances. The people who build the tools also get a say, as do support orgs and events, and the users who will be spread widely get a say, but their power is diluted by the much larger numbers involved.