@lnxw48 They _are_ desirable features in the technical _specification_ of the protocol. There is absolutely no reason for anyone to have an implementation which accepts spam.
The way to solve this - which is being worked on - is to have another type of subscription (i.e. conversation thread, which is already an RSS/Atom feed - just no mechanism to subscribe). Not an ugly hack (randomly accepting new, unasked for notices) which diverts from any spec out there.

Noone is saying that missing notices are a feature.