Recently PayPal has been asking for more personal information when creating an account. There are new laws nationwide and worldwide laws in effect to help stop money laundering, illegal accounts, etc.
To sum it up, PayPal just wants to make sure that you are who you say you are and that the account is legit.
Here is a direct link straight from PayPal explaining and answering any questions or concerns that anyone wanting to donate might have. As a side note, this has been in effect since mid-2012.