Not being one of the community members that voted to close this question, I can only speak to why I would have cast that vote.
While it may be a good topic to form a question, I don't think it is a particularly good question for a Q/A site as it seems broad and open ended in it's current form.
It also really isn't about networking, the protocols that networks use, or the functions of a network in a professional setting. This question is more related to a service that passes over a network and could be compared to why a "when I send an email, why doesn't the recipient receive it" question would also be considered off topic.
This does not mean that it would be off topic on another stack, such as Super User, if posed as a professional related question at Server Fault, or it may fit on Information Security. Ultimately, it would be for those communities to decide if that was the case.
It also doesn't mean that security/exploit questions are off topic on this site, as long as they fit within the other on/off topic decisions made by the community. I could probably find a few examples of existing questions, but personally don't have the time presently.