On Reddit, before it went full goose step, you'd have the problem where the top mod of r/linux would be this weird open source zealot who would delete any thread that had any practicality in it. So actual discussion of using Linux would happen in r/linuxmasterrace, which was nominally a meme sub but it's where the actual community landed. You could use Reddit's vast namespace to steer around an individual top mod.
You couldn't steer around Reddit's admin though, they have root access to the servers, they can, have and increasingly do shut things down they don't like. It's double plus ungood.
Lemmy, and indeed the entire Fediverse, offers every user the Bender gambit. You can make your own instance with blackjack and hookers. There is no mechanism to shut it down everywhere. Instances are hosted by multiple people on multiple hardware platforms on multiple power grids in multiple countries under multiple jurisdictions.
The top mod of !linux@example.lol is being a shithead? You could make !actual_linux@example.lol, or you could start !linux@lemmy.world, or you could start your own instance and then YOU are in control of who gets to be a mod on at least one instance. No one person has the power to shut down everything everywhere; you start talking about severing undersea cables at that point.