The big subs have figured out an extensive set up of bots and moderation guidelines, while investing their own time, all for free. Reddit’s mod tooling is extremely abysmal, that’s part of the protest. (Only 3P devs have bothered building more advanced tools.) A new mod will not have the expertise or careful set up from the previous mods.
Most of the mods are debatably not power hungry, particularly on a sub like Music or Videos. Finding a replacement mod team without specific agendas is going to be hard. Only the most power tripping or ideologically driven will want the position as paying mods seems out of the question given Reddit’s stance.
Inexperienced mods will also be unable to handle the torrent of spam and low effort posts and comments the big sub attract.
It’s not impossible to punish the dissident mods but having a functional replacement on short notice is impossible.