Pretty much the only subs that had mods that got them assigned where the main default ones, but that was at the beginning and pretty much all those big sub mods just wanted the power and literally would do anything they could to get in with other big subs as mods even if they didn’t contribute.
Reddit never assigned mods until the exodus. Almost all communities had people who created them as the mods.
I was mod in a one with assigned mods, and one of them had been assigned to multiple subreddits
Edit: Actually, I didn’t see that happen myself, that was just the rumor, and could have been part of in-mod drama, of which there was a bunch.
Pretty much the only subs that had mods that got them assigned where the main default ones, but that was at the beginning and pretty much all those big sub mods just wanted the power and literally would do anything they could to get in with other big subs as mods even if they didn’t contribute.