i mean that you can't really make anything private, because everything is authenticated in your hands if you can see it

if someone posts some dumbshit, they literally sign off on the dumbshit and if someone who read it doesn't like it they can share it to others by broadcasting it or posting it to a public relay

so, it's a leaky bucket, no matter what, you always have the possibility of a private relay sending your note to someone who decides to broadcast it