The organization is undertaken outside of game. Most groups such as ours use discord, or forums or both. Action is coordinated there and a faction can be expanded and managed quite effectively that way.
AEDC formally adopted a faction back when it was possible, we had been working it for months before the adoption process opened. We also work some other factions, while not formally attached to us via FD, we consider them "ours".
That said, if 1000 cmdrs decided tomorrow to take any of our faction in another direction there is little we could do.
Factions are supported by player groups rather than owned by them. Little difference really.