There are still propagadists here, and they are leaving no stones unturned by covering as many platforms as possible.

Not if Lemmy sticks to their platform.

That's the potentially nice thing about Lemmy though - if you're savvy, you will probably start to identify which instances are more or less trustworthy than others. And if an instance tends to have a lot of untrustworthy activity, defederation is always an option. To what extent we'll see those things play out, I don't know yet, but it'll be interesting to see.