Comment by noodlesUK

As much as I think things like this can be fun, depending on your jurisdiction (and tbh the US loves extraditing people for silly computer crimes), it might not be advisable. This is all but certainly illegal at least within the US. I’m sure most competent security experts have been tempted to do things like this, or SQLi a scammer’s form and nuke their DB, and usually bad things won’t happen to you, you might find that you’re hacking something you weren’t expecting, and might piss someone off other than a scammer.