Read under settings:
"U.S. Internal Revenue Service Information
Please indicate if you are a resident of the United States or if you qualify according to IRS guidelines found here:

 I DO live in the United States OR qualify according to the guidelines above. I DO have a United States postal address.
 I DO qualify according to the guidelines above. I DO NOT have a United States postal address.
 I DO NOT live in the United States AND DO NOT qualify according to the guidelines"

What you are required to fill in and send to them depends as you see above.
(As I understand they are doing minimum requirements which is keeping the info INCASE government require them.)