except he clicked the link, he did initiate the communication so your bizarrely overly paranoid guidance doesn't apply. Not taking anything from anyone certainly closes you off to the generosity that can be found in humans.
Telephone charity calls are exactly the same way in my world, and started me down that handling path. If I look your org up and you look legit, and I'm interested, we'll see. You having called me isn't always strike one, but it often is.
Personally, I prefer to follow the OP's advice, and only provide information if I initiate the call. Or, more specifically, I'm willing to provide only the information you could find in a phone book, such as name, phone number, and address, and if they truly want my donation, they can mail me something for the request. Still, it could result in mail fraud, but the likelihood is pretty low at that point.