"external communications blocked" points out that it is theoretically possible with 1. process level security, 2. content security policy, on the setting page. (I don't mention about "backdoors")

Currently, both are a little "loosen" to make MVP easy to proceed.

On the next version, you will see a certain link for helpful guide gets not working. That's because it adds 1 level of process security.

It will lower UX and increase security.

But okay! link remains there, only doesn't work. So you can open copying the link address and pasting it on a new tab.