[vbezhenar]

User willingly installs their software, they are not backdooring it. There are plenty of services running on every computer, including TCP servers and web servers. If you're going to call them backdoors, you've got a long list.

[ghostpepper]

If I think I have installed your software and it's secretly running a web server with the ability to reinstall itself, I am calling it a backdoor. I think that list is pretty short, but perhaps I am wrong.