Yahoo has finally answered to my last request
Hello, Thank you for contacting Yahoo! Customer Care.
We appreciate your report regarding the use of your credit card. If you are seeking to obtain the registration information we have on a
particular user, we will need you to supply our legal department with a
subpoena or a court order. In most cases, the owner of the mail account is not aware that his/her
ID has been used in association with the charges on your card. Please
bear in mind that it may not be appropriate for Yahoo! to take action on
an account without sufficient information.
One option you have may be to contact the site that has charged your
card to see if they collect the IP address of the mail account in
question. The IP address would correspond to the user’s ISP (Internet
Service Provider). You then might want to contact the ISP to see if they
can provide you with verified information on the account.
Please let us know if you still need assistance so I may assist you
Your patience during this process is greatly appreciated.
Thank you again for contacting Yahoo! Customer Care.
Yahoo! Customer Care
At no point I have requested the user data of any account and at no point of all my mails I have mentioned anything about my card being abused.