I'm planning to scam the clients
How are you going to scam them?
I manipulate their data by executing my code inside their network
You shouldn't scam the clients, you could go to prison for that. It would be better to be honest in your dealings even if you don't make as much money.
I'm doing well for now.
You are going to get caught scamming people eventually. It is not okay to scam them, it is going to come back to bite you.