User blog comment:Dzylon/Why pirate Terraria?/@comment-4026446-20120111154118/@comment-4750693-20120111190435

And any pirated version won't connect to online well. Not unless it's set to allow. And most won't allow that. It's like the whole modding a system and then not being allowed online; yes, that is your property at home, but then you go online into someone else's domain. Hence why with Minecraft, you can pirate as you wish (Notch doesn't care himself), but servers have the discretion to deny you access for pirating.