A few days ago, I clicked an age restricted video on Youtube and usually I just state that I am above 18 but now they ask for a credit card number or an identity card to prove it. I am not going to send this just to watch some random video clip that users have declared not appropriate to a young audience because it features a zombie. Seriously!
I got the same thing and it left a bad taste in my mouth -- it felt to me that it was just Google's excuse to hoover up more information about me.
No, Google, I am not going to give you my credit card of government issued ID.