[Runpod] Make Community Cloud an "opt-in" (disable by default)

docs/docs/concepts/backends.md

@@ -1105,10 +1105,27 @@ projects:
 </div>
 
 ??? info "Community Cloud"
-    By default, `dstack` considers instance offers from both the Secure Cloud and the
-    [Community Cloud](https://docs.runpod.io/references/faq/#secure-cloud-vs-community-cloud).
+    By default, `dstack` considers instance offers only from the Secure Cloud.
+    To also include the
+    [Community Cloud](https://docs.runpod.io/references/faq/#secure-cloud-vs-community-cloud),
+    set `community_cloud: true` in the backend settings.
 
-    You can tell them apart by their regions.
+    <div editor-title="~/.dstack/server/config.yml">
+
+    ```yaml
+    projects:
+      - name: main
+        backends:
+          - type: runpod
+            creds:
+              type: api_key
+              api_key: US9XTPDIV8AR42MMINY8TCKRB8S4E7LNRQ6CAUQ9
+            community_cloud: true
+    ```
+
+    </div>
+
+    You can tell Secure Cloud and Community Cloud apart by their regions.
     Secure Cloud regions contain datacenter IDs such as `CA-MTL-3`.
     Community Cloud regions contain country codes such as `CA`.
 
@@ -1124,23 +1141,6 @@ projects:
 
     </div>
 
-    If you don't want to use the Community Cloud, set `community_cloud: false` in the backend settings.
-
-    <div editor-title="~/.dstack/server/config.yml">
-
-    ```yaml
-    projects:
-      - name: main
-        backends:
-          - type: runpod
-            creds:
-              type: api_key
-              api_key: US9XTPDIV8AR42MMINY8TCKRB8S4E7LNRQ6CAUQ9
-            community_cloud: false
-    ```
-
-    </div>
-
 ### Vast.ai
 
 Log into your [Vast.ai](https://cloud.vast.ai/) account, click Account in the sidebar, and copy your

src/dstack/_internal/core/backends/runpod/models.py

@@ -4,7 +4,7 @@
 
 from dstack._internal.core.models.common import CoreModel
 
-RUNPOD_COMMUNITY_CLOUD_DEFAULT = True
+RUNPOD_COMMUNITY_CLOUD_DEFAULT = False
 
 
 class RunpodAPIKeyCreds(CoreModel):