Similar and entertaining: This kid went to my server and he never talked to anybody and he quickly jetted around the build and went afk
I knew he was going to save the build so I did quick thinking and banned him permanently for this reason: "Attempting to steal the build; mondaychicken."
I ban people who try to save my build without asking to save it since that means they want to steal it.
Ok, now what kind of thinking is this? A user just jets around a build and goes afk, so that makes you think he's going to save your build and claim it as his own? For all you know he was just probably checking out how the server looked and went afk to do something quick, don't be so damn quick to jump to conclusions.
One of the main points of the saving system is to save builds of others which you could later use for other things, there is no asking for permission when it comes to stuff like this. How would you even know if someone was saving your build anyway. It's okay to use someone else build, but it's not really good when someone tries to claim it as his/her own.
Now on topic, I think it would be pretty obivous that he didn't build those. Those builds have distinct styles and there's no way he built that house bricki made in an hour. I know someone else is going to come and say that it isn't that big a deal he stole builds, but it's still a pretty pathetic thing to do.