It is the relays responsibility to relay not the clients
Discussion
Is there a diagram of how this works…because I can’t even visualize it.

So Outbox is basically a mobile data plan disaster?
That and inefficient media, especially with Blossom, yes.
The power comes from the fact that you can switch away from Nostr.land if we abuse your trust to an alternative provider or back to outbox.
But you won't need to.