Why I donated him? For god and for myself.
If there is 1% chance that thread donation closed and his heart problem me is worth donating him so he will not die.
Which religion do you follow?
I am a Muslim and when we give donations we never look back to see if it went to the right cause or not. A person who falsely took your donation (as per your thinking) will face the consequences by nature and your money will be written with God that you did the right thing. So why do you worry about giving the donations to anyone?
Finally, I really never believe that Yahoo ever scammed or tried to scam with his donations. Have a good faith and don't attack the person who recently has a heart problem.