This is off topic, but most assuredly it is the case that communication is not banned by the license. The license protects the developer from liability lawsuits, not from communication.
Most developers encourage communication so they do have the feedback and can adjust their software to better serve the community. It is then up to the developer if they wish to respond to users requests, comments, problems, etc. After all how does a developer know if the product is doing as expected (or not) if feedback is banned?
Almost every license has similar terms in the FOSS community and most of the proprietary software has terms that limit liability as well.
Here is an example from the Apache 2.0 license found here.
7. Disclaimer of Warranty. Unless required by applicable law or agreed to in writing, Licensor
provides the Work (and each Contributor provides its Contributions) on an "AS IS" BASIS,
WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied, including,
without limitation, any warranties or conditions of TITLE, NON-INFRINGEMENT,
MERCHANTABILITY, or FITNESS FOR A PARTICULAR PURPOSE. You are solely responsible for
determining the appropriateness of using or redistributing the Work and assume any risks
associated with Your exercise of permissions under this License.
8. Limitation of Liability. In no event and under no legal theory, whether in tort (including
negligence), contract, or otherwise, unless required by applicable law (such as deliberate and
grossly negligent acts) or agreed to in writing, shall any Contributor be liable to You for damages,
including any direct, indirect, special, incidental, or consequential damages of any character
arising as a result of this License or out of the use or inability to use the Work (including but not
limited to damages for loss of goodwill, work stoppage, computer failure or malfunction, or any
and all other commercial damages or losses), even if such Contributor has been advised of the
possibility of such damages.
Does Apache or any other developer prevent users from providing feedback? I think not!