You can use some tools like web of trust and sharing broader blocking information (npubs, tags, etc.) but there are very few cases where 1 person can unilaterally prevent everyone else from seeing a third party's posts. They have always got to opt-in. This is by design, as doing otherwise is antithetical to the very concept of how nostr works. As I understand it, fundamentally at a conceptual level, a note is *not* the equivalent of starting a forum thread. Replies to a note just indicate what they are in response to, and the software bundles together all things that do so in that specific way. The structure for receiving notifications for your is more like subscribing to anyone talking about an event in a way the software registers. The advantages to this are that bad actors are vulnerable. They are unable to prevent others from directly discussing what they post. This includes people who do in the replies - someone commenting negative things cannot simply block others to make it seem like their negging is unchallenged by hiding retorts, corrections, etc. #aubreykunyap