diff --git a/docs/matrix.md b/docs/matrix.md
index 5bc4328e..b0c0040f 100644
--- a/docs/matrix.md
+++ b/docs/matrix.md
@@ -67,12 +67,6 @@ services.hyperhive.swarm.matrix = {
 };
 ```
 
-A rebuild on a host that already has a homeserver prints a
-`hive-matrix: WARNING — … serverName is unset` line when this is missing,
-naming the value it is about to default to. That warning is why this
-section exists; it never fails the rebuild, so it is on you to act on it
-before the ids are minted.
-
 ## Default-closed firewall
 
 `openFirewall` defaults to `false` (secure-by-default): the host
diff --git a/nix/host-modules/hive-matrix.nix b/nix/host-modules/hive-matrix.nix
index b2089c34..0661aa6b 100644
--- a/nix/host-modules/hive-matrix.nix
+++ b/nix/host-modules/hive-matrix.nix
@@ -758,51 +758,6 @@ in
     # would hand tuwunel an empty file on first boot and break every
     # registration until restart. Idempotent;
     # docs/matrix.md::Provisioning flow.
-    # Tell an operator whose homeserver already exists that `serverName` is
-    # unpinned, at the one moment they are looking: the rebuild.
-    #
-    # ⚠️ An activation script and NOT `warnings`, which is where this
-    # obviously belongs and does not work. The condition needs the host
-    # filesystem — does a homeserver already exist here? — and
-    # `nixos-rebuild switch --flake` evaluates PURELY, where
-    # `builtins.pathExists "/var/lib/…"` answers **false** rather than
-    # throwing. A `warnings` entry gated on it would evaluate, deploy, and
-    # print nothing, on every real deployment. Same shape as an option whose
-    # consumer is disabled: renders perfectly, does nothing.
-    #
-    # Only rendered when `serverName` is null, so a hive that pinned it
-    # cannot be nagged — the script does not exist there rather than
-    # existing and choosing to stay quiet. A guard that cries wolf at a
-    # correctly-configured deployment is worse than no guard, because the
-    # next real one is read as noise too.
-    #
-    # Never fails. This warns about a choice that cannot be undone; refusing
-    # the activation would break the rebuild of a hive that had already made
-    # that choice deliberately, which is the opposite of helping.
-    system.activationScripts.hive-matrix-servername-pin = lib.mkIf (cfg.serverName == null) (
-      lib.stringAfter [ "var" ] ''
-        # The homeserver's own database, asked of the container's evaluated
-        # config rather than hardcoded: a guessed path resolves cleanly and
-        # silently never matches, which is exactly the failure this guard
-        # exists to avoid one level up.
-        dbDir=${
-          lib.escapeShellArg (
-            # Same host-side container-root prefix this module already writes
-            # by hand for the SSO secret copy above — not a second convention.
-            "/var/lib/nixos-containers/hive-matrix"
-            + config.containers.hive-matrix.config.services.matrix-tuwunel.settings.global.database_path
-          )
-        }
-        if [ -d "$dbDir" ]; then
-          echo "hive-matrix: WARNING — services.hyperhive.swarm.matrix.serverName is unset, and this host already has a homeserver at $dbDir."
-          echo "hive-matrix: it is defaulting to ${effectiveServerName}, which is baked into every NEW user and room id."
-          echo "hive-matrix: if ids here were minted under a different name, existing accounts and rooms are stranded — reverting the config does NOT undo it."
-          echo "hive-matrix: pin whichever name this homeserver already uses, e.g.:"
-          echo "hive-matrix:   services.hyperhive.swarm.matrix.serverName = \"''${HIVE_MATRIX_EXISTING_SERVER_NAME:-<the name already in use>}\";"
-        fi
-      ''
-    );
-
     system.activationScripts.hive-matrix-register-token = lib.stringAfter [ "var" ] ''
       tokenFile=${lib.escapeShellArg (toString cfg.registrationTokenFile)}
       if [ ! -s "$tokenFile" ]; then