I find this entire thread absurd though...if the person wanted to get fair credit, they should have used a different license. It's like saying "Hey, totally ok to have a beer from my fridge. But I'd reallyreally plead you to drop in a buck... but only if you wish though. But I highly recommend it. It would be shame if you don't. Most people don't want to be shamed do they?"
Just be straight forward and put that in the license. Otherwise, it is truly optional and should be treated as such.
As much as I dislike having trillion dollar corporation not give a credit, that's why we have licenses.
How is he not complaining. He totally is.