Further reduce threshold

src/lox_analysis.rs

@@ -65,13 +65,13 @@ fn too_few_bridge_ips(
         // expect 10
         0
     } else if max_users <= 40 {
-        // expect 30
-        8
+        // expect 30, possibly as few as 21
+        0
     } else if max_users <= 96 {
         // expect 90
-        16
+        8
     } else {
-        32
+        16
     };
 
     // If we see positive reports from trusted users, halve the minimum