- it is a public action that can be enumerated/searched. So, someone can choose to create consequences for blocking them, transforming the action "block X visibly" into "block X and alert X (or Y) that I did that, with further consequences"
-- plus: this searching, and so the transformation, can be done at any time after the fact and so past block-actions can be made differently- and more- -consequential post-hoc
- it's not intuitive to users, leading to people assuming they're doing one thing "block X and block X's visibility of my actions" when in fact they're, potentially, actively alerting X
I think they're different because imo one is a pitfall people can stumble into (and can be improved by UI work, documentation, publicizing),
and one is about the basic actions and affordances the platform provides and doesn't provide, to both the block-er and the block-ee.