the networks where e-mail is blocked are not likely to allow SSH tunnels, VPNs, or Tor connections out either.
We also aren't talking about making all programs that communicate talk multiple protocols, we are talking about a specific use-case, submitting bug reports. By definition, when you are submitting a bug report, something is broken. As such, you should support multiple ways to submit the bug so that you can work around whatever is broken.
Also, the networks in question are only "broken" if you think that every computer in existence should be able to talk freely to every other computer in existence. This model of reality disappeared (if it ever really existed) decades ago. Security and Access restrictions are not only just the reality, they are very desirable in many cases.