I disagree. Lemmy is more resistant to bots because there’s no perverse incentive to boost user activity numbers to please investors and advertisers. Reddit for example doesn’t really care if most comments are fake on a post. It’s still interaction and it pumps numbers. Lemmy is built and run by us. It serves no other masters.
Given that users naturally self-sort into instances, your trolls are also more likely to congregate on instances and communities that can be blocked. I don’t want to name any names but I do block some instances from my view for a reason. The Russian bots congregate in places that are amenable to this, and the design of Lemmy encourages this self-sorting into places where you’re accepted.
The problem is still significant, but there are advantages to the fediverse.