End to end encryption can hide the recipient, at the cost that each recipient has to attempt to unencrypt all encrypted messages with their key to see if they were the intended. This is fairly fast on modern computers, and is how secure scuttlebutt works. Note this is only feasible on gossip protocols, pub-sub, or content addressable hash stores where you are only looking at a subset of the users that you follow, instead of inspecting all traffic without another side channel for indicating what messages should be inspected.
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End to end encryption can hide the recipient, at the cost that each recipient has to attempt to unencrypt all encrypted messages with their key to see if they were the intended. This is fairly fast on modern computers, and is how secure scuttlebutt works. Note this is only feasible on gossip protocols, pub-sub, or content addressable hash stores where you are only looking at a subset of the users that you follow, instead of inspecting all traffic without another side channel for indicating what messages should be inspected.