Thanks to everyone here being ridiculously paranoid, I had no choice but to trust prophexy (aka gentooxx@gmail.com and MatthewBTC@Gmail.com) to activate my gift card and do the donations on my behalf. Needless to say, I got scammed.

As soon as he got the card's details on November 2nd, he withdrew all the money to his Serve account (SERVE VIRTUAL ENT INC SAINT PETERSB FL reference#: 24110391306816000124859) instead of donating it directly. Apparently his aim was to prevent me from checking the card's statement to see whether he donated or not.

Then he tried to keep me oblivious to the fact that he's a scammer for as long as possible...

On November 2nd, he sent me a PM saying: I have loaded the balance of the gift card onto a physical Serve AMEX debit card of mine, so I can more easily do the donations.  I'll send proof as soon as I get to it tonight (More easily my ass)
On November 5th, he said: I've just been extremely busy recently. It will probably get done tonight or tomorrow morning.  Stop worrying so much, I'm not one to scam.
On November 8th, after my persistent complains for breaking the deadlines which he himself set, he went into the new low of I am doing you a favour, please remember that.. Anyhow, as soon as I do the donation I'll send you screenshots.. He also mentioned here what I consider to be his first official scam announcement: To be honest, another reason I am holding on to the money is to wait and see if there's any way you can scam me

Frustrated, I gave him 48 hours during which he could either make the donations or refund my money.

So finally, I got this polite Fuck You from him just yesterday: The main reason I have not donated yet is the card that was holding the money got stolen.  I honestly don't give a shit if you believe me or not, but that's the main reason.  I tried to hide this fact from you due to the fact you probably wouldn't believe me, but oh well.
He didn't forget to assure me that he'll do his best to make the donations as soon as he can, of course.

For everybody's lulz, the card's details which can be viewed at wellsfargogiftcard.com are:
Card Number: 4167250048584140
Security Code : 719

Fortunately, I have a way to screw him for that, which he'll find out about soon. I lost interest in donating to the projects now though. At least nobody can claim I haven't tried.