It doesn’t work, on Lemmy block is nothing more than a mute, and the instance “block” (mute) does not even affect the individual users of an instance, just hides the comms of that instance from your view

Lemmy’s “block” still leaves you open to all manner of brigading that they’ve been known to do

And it still allows conspiracy theories, propaganda and misinformation to spread and fester and affect users who are unaware

They literally have articles over there spreading the Russian propaganda that Putin is justified in invading Ukraine because it’s “full of Nazis”

Besides this is the Threadiverse, there will always be an instance with wide federation if you as an individual choose to open yourself up to that kind of “content”