If you are going to provide this "service" for everyone, you should at least obey the GPL, fork this, and post the source code along with the binaries. You cannot change the code and only provide binaries.
Who's going to stop him? The open source software police? Interpol? The Avengers?
You can distribuite GPL binaries without source code, but accompanied with an offer to get the source code. The price of the source code cannot be higher than the price of the binaries.