In fact, asking about Hashnode is allowed and encouraged, depending on the topic. Interested in the stack behind Hashnode? How is the data organized? What problems does Hashnode face with their CI and how do they solve them? The team might welcome and answer these questions ;)
If you, however, want to give feedback or found a bug, there is a menu for that. You can find it at the bottom of the right-hand menu:

Always remember to be nice in tone, even if you think that you were treated wrongly. Everyone here is human, and it is human to err.