Streams and Hubzilla are conversation based, not message based. The person who starts a conversation decides on the audience and locks it in. In our universe, if you're not in the conversation you'll never see a mention or be able to reply.
and also
In our universe a conversation and "my page" are containers. It may be your comment, but it's my container. As the container owner I can delete anything you attempt to put inside it and I certainly don't need your permission to do so.
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fediverse