Yes. Subforums should elect mods democratically.
As long as sub forums can be created easily, users may pick their sub forum and thus indirectly moderator.
In this setup having users elect the moderator leads to cases where small groups create their special interest group and then some trolls challenge the moderator.
Their may be some oversight on the large sub forum, but not all.
Stack Overflow does this and it works far better than arbitrary tyrant style moderation.
Why? Genuinely curious.
I am a big proponent of (direct) democracy in general.
sadly, a nice idea that is painfully naive with how computers are used in reality.
One need only remember how easy it was to take over IRC channels with a few hundred bots to see the endgame of this rationale… it cannot be patched out, it’s inherent to the internet.
That which would make a vote valid; can (and will) be gamed.