Is there something that prevents this?

[kxait]

Lets say there are two users: Foo and Bar. Foo wants to sell Bar an XFR. Bar has the money, and goes first. He sends Foo say 100k €, but Foo tries to be a cheeky a-hole and doesn't send the car. Instead, he leaves the server.

Now, is there anything that says Foo can be banned for this, or can he just get away with it?