The real surprising thing here is that, if a person is capable of doing something like this for a faucet, how much developing skill does he have that goes unused? I mean we are talking about a guy who built a software that tries the faucet automatically, then if he busts switches the account and IP/VPN to try another account and continues as long as possible until he actually abuses the faucet, now that is some software developing skills right there, I personally wouldn't know how to do that and I have been a web developer for years! So we are talking about a guy who could use these kinds of skills he has on something much more productive instead of destructive and could make a decent amount of money, yet he uses his powers for evil and not for good, which is shocking.
That's the problem, there's so much untapped talent out there. Some of these people will talent end up using it for nefarious purposes.
There's actually an entire term devised for itcriminal ingenuity.
With that said, creating a script to automatically claim faucet and switch IPs is not exactly rocket size. Anybody with basic python knowledge could do it, and you could get a script kiddie to whip one up for less than $100.
i believe mintdice team have already thought about such possible abuse and who knows, they have their tight security measures in place already? being in the gambling industry, you should think of these things esp that softwares are now getting sophisticated.
this is the reason why they are in continuous development, improving their system, checking possible bugs, adding more features on their site etc...