No, we tested the tool hundreds of times for any leaks and no account has ever been banned, we don't actually hack the game, we just send packets of resources towards the servers with your username in them.
The tool is and will be free for as long as the game is available. We don't plan on monetizing it.
You can use it as many times as you wish, but we suggest you take it easy, only generating Gold once every ten minutes just to be safe.
We send packets of data once every 5 minutes, so it takes a maximum of five minutes to receive all your Gold.