How do we effectively report users and/or communities?

There's a user on lemm.ee who has been making hundreds of communities over the last few days, but it seems like a flag-planting operation more than anything else. It would be impossible for one person to moderate all of these communities, and they have zero post or comment history.

Is this a bot, or a person with way too much time on their hands? Regardless, is there a way to, like, address this? Or is that a dead-end?