The filtering of blocked replies is done server-side. You can view whatever top-level posts you want in the protocol; making those visible/invisible is up to th

The filtering of blocked replies is done server-side. You can view whatever top-level posts you want in the protocol; making those visible/invisible is up to the client software. If I post something that gets traction, and someone replies with an ad for ED pills, I should be able to remove that spam from the discussion on my thread and not just from my view of it. If others have already "engaged" with a plug for boner pills, their replies are not lost but are just no longer part of the thread stemming from my post. If you as the OP don't want this behavior, there are other tools at your disposal (mute the replier instead, "hide for everyone", etc).