I think the federated approach Lemmy is taking can both help with that and exacerbate it. While it’s easy to push fringe views, it’s also easy to quarantine/block off servers that are going in that direction. I’m not sure what tools are available for doing that in Lemmy, but I don’t imagine it would be hard to block users from a Voat-like server if push comes to shove. It winds up coming down to the culture and values of the server you’re on, and if those go in a direction you don’t like you can also go elsewhere. Sort of like how there were bots that would pre-emptively block people that post in specific subreddit, but more granular control so you don’t wind up with situations like where someone would post in /r/conservative to argue against misinformation, then find themselves blocked from leftist subreddits. Here, if you’re a member of a leftist Lemmy server, that’s part of your identity so it’d be easier to see situations like that and prevent collateral damage from blocking members of the alt-right server from brigading. The only issue there is that it also becomes easier to set up echo chambers, so there’s a fine line to walk. I’m rambling a bit, but hopefully I’m making sense.