Tbh, I don't believe in that. There are many open-source projects that are more secure because it's open. Bitcoin itself is open and the concept itself makes it secure.

BTW, I absolutely agree with you and most here that its gonna be incredible hard, or even impossible, to make a faucet script that is protected against bots and scammers. That's is also my dilemma (and mentioned by others) if this should be open or not.

But here is an analogy I would like to make. If people want to steal your bike, they probably will be able to do so, even if you put multiple locks on it. Does it mean I should park my bike without a lock? Of course not. Or worse, should I not own a bike at all? With cryptography it's the same not. It's not so much if a person or an organisation is able to crack a code, it's a matter of how much effort, energy, cost, etc. And obviously the level of current technology.

Anyway, I'm rambling.... sorry for that :-)

Cheers

PS: FIB is not open-source AFAIK. We are just able to read the source code and mod it although the last is formally not even allowed.