Be more explicit about what's allowed on our properties (kubernetes#4385

)

* Be more explicit about what's allowed on our properties

Signed-off-by: Jorge O. Castro <jorgec@vmware.com>

* Add some positive examples and small fixes

Signed-off-by: Jorge O. Castro <jorgec@vmware.com>

* Make this word present tense

Signed-off-by: Jorge O. Castro <jorgec@vmware.com>

communication/README.md

@@ -36,6 +36,22 @@ devoted to the Kubernetes project. Please check the guidelines and any relevant
 chat/conversation history before posting. Spam and sales pitches are not tolerated
 on these platforms.
 
+### Appropriate Content for Community Resources
+
+All communications properties are under the [Kubernetes code of conduct]. 
+Additionally, these resources are for the contributors and users of Kubernetes; commercial usage of these properties is heavily moderated.
+Note that commercial content is allowed, unsolicited commercial content mostly is NOT:
+
+Examples of inappropriate content:
+- Posting unsolicited content of a commercial nature on Slack or other community forums
+- Messaging people individually on a platform with content of an unsolicited commercial nature
+- Unsolicited pitching of commercial products during a Kubernetes meeting
+
+Examples of appropriate content:
+- Asking about commercial products in an appropriate channel. For example most clouds have a channel in Slack, asking how to use GKE on the GKE channel or AKS on the Azure channels is fine.
+- "Does anyone have experience with project foo?" is fine
+- Some OSS projects are also hosted on the Kubernetes Slack that also have a commercial offering, these are allowed. 
+
 ## Decisions Are Made Here
 
 The project is very large with a robust community group ecosystem and bubbling up
@@ -201,4 +217,4 @@ place!
 [#kubernetes-dev]: https://app.slack.com/client/T09NY5SBT/C09R23FHP
 [#sig-contribex]: https://app.slack.com/client/T09NY5SBT/C1TU9EB9S
 [#office-hours]: https://app.slack.com/client/T09NY5SBT/C6RFQ3T5H
-[office-hours]: /events/office-hours.md
+[office-hours]: /events/office-hours.md