Some of it had to do with there not being enough admins to go around afaik. Lemm.ee for instance couldn’t find enough admins so they shut down. Moderating an instance seems like one of the hurdles that go along with running an instance. I could imagine some people dipped out of Lemmy for a little while if their server was deleted since they’re starting from scratch again. It took me a good month or so to make this account and ramp back up my own activity here for instance.
The admins across the servers do a good job of keeping bots out imo. If it ever becomes a problem the admins could look to adopt BlueSky’s moderation tools down the line, I feel. As BlueSky makes it easy to filter bots, misinformation spreaders, and have user level content controls.
Teaching them about logical fallacies and how to spot them may be the best defense against these types of personalities imo. Many influencers that you’re concerned about try to prey upon these fallacies, so teaching your kids to spot them can help them to realize those people are full of shit.
Curating their content a bit to include more people you want them to be like can help as well, at least then they can have good people to look up to.
If your kids think you have their best interests in mind, I feel they’re less likely to push back and more likely to respect the boundaries you put down.