definitely, coolest thing is that these are interoperable between clients and you'll be able to have public/private block and follow lists.
Discussion
That's even cooler. You're right.
When you mute a user are notes from that user still retrieved from the relay and just not displayed by the client or are they never retrieved from the relay in the first place?
It's more of a client side filter. Notes are still retrieved, they're just not displayed.
That's what I figured. We need a relay that we can self host and connect to when on mobile that filters out all unwanted content from being retrieved. We will have to wait and see if relay to relay communication happens. That way when I am on mobile I am only connected to my self hosted relay. The self hosted relay would do all the filtering for the mobile client.