This is great! I think the ones that get more subs will generally rise to the top and people will start congregating there.
I'm seeing a bunch of upvotes on peoples comments here. I'm hoping that those people are also subbing to the communities they see in here.
I'm gonna try to remember to post this kind of question maybe once a month and over time we'll get communities popping off.
I suspect there are a decent amount of people from major cities on here. If you start one of these asklemmy threads saying 'hey any people from tokyo here' and then in the text field just out a tokyo specific community address in there and say let's congregate here. You'll prolly get 20 people. This community has 11k MAU which is large enough to get a lil something going I'd think.