--- libmalloc/libmalloc-657.80.3/src/pgm_malloc.c
+++ libmalloc/libmalloc-657.60.21/src/pgm_malloc.c
@@ -1151,7 +1151,6 @@
 	bool internal_build;
 	bool MallocProbGuard_is_set;
 	bool MallocProbGuard;
-	bool targeted_coverage;
 } g_env;
 
 void
@@ -1164,13 +1163,6 @@
 	if (env_var("MallocProbGuard")) {
 		g_env.MallocProbGuard_is_set = true;
 		g_env.MallocProbGuard = env_bool("MallocProbGuard");
-	}
-
-	const char *all_factors = env_var("__TRIFactors");
-	const char *pgm_factor =
-			"PROBABILISTIC_GUARD_MALLOC_TARGETED_COVERAGE:enable=1";
-	if (all_factors && strstr(all_factors, pgm_factor)) {
-		g_env.targeted_coverage = true;
 	}
 }
 
@@ -1203,47 +1195,42 @@
 
 #if TARGET_OS_WATCH || TARGET_OS_TV
 static bool
-is_low_memory_device(void)
-{
-	uint64_t low_memory = 1.2 * 1024 * 1024 * 1024;  // 1.2 GB
-	return platform_hw_memsize() <= low_memory;
+is_high_memory_device(void)
+{
+	uint64_t high_memory = 1.2 * 1024 * 1024 * 1024;  // 1.2 GB
+	return platform_hw_memsize() > high_memory;
 }
 #endif
+
+#define PGM_ALLOW_NON_INTERNAL_ACTIVATION 0
+
 
 bool
 pgm_should_enable(void)
 {
-	// Env var override
 	if (g_env.MallocProbGuard_is_set) {
 		return g_env.MallocProbGuard;
 	}
-
-	// Feature flags
-	if (!FEATURE_FLAG(ProbGuard, true)) {
-		return false;
+	bool internal_build = g_env.internal_build;
+	if (FEATURE_FLAG(ProbGuard, true) && should_activate(internal_build)) {
+#if TARGET_OS_OSX || TARGET_OS_IOS
+		return true;
+#elif TARGET_OS_WATCH || TARGET_OS_TV
+		if (is_high_memory_device()) {
+			return true;
+		}
+#elif PGM_ALLOW_NON_INTERNAL_ACTIVATION
+		return true;
+#else
+		if (internal_build) {
+			return true;
+		}
+#endif
 	}
 	if (FEATURE_FLAG(ProbGuardAllProcesses, false)) {
 		return true;
 	}
-
-	// Excluded configurations
-#if TARGET_OS_WATCH || TARGET_OS_TV
-	if (is_low_memory_device()) {
-		return false;
-	}
-#elif TARGET_OS_BRIDGE || TARGET_OS_DRIVERKIT
-	if (!g_env.internal_build) {
-		return false;
-	}
-#endif
-
-	// Targeted coverage via Trial
-	if (g_env.targeted_coverage) {
-		return true;
-	}
-
-	// Random activation
-	return should_activate(g_env.internal_build);
+	return false;
 }
 
 static uint32_t