Skype/eBay/PayPal in Big GPL Trouble

I don’t think eBay, and its subsidiaries PayPal and Skype have any idea the size of the hole they’re digging for themselves.

Today, Skype, part of eBay is arguing that the GPL is invalid. Therefore, they have not accepted the terms of the agreement. OK, fine, however, the license reminds:

5. You are not required to accept this License, since you have not signed it. However, nothing else grants you permission to modify or distribute the Program or its derivative works. These actions are prohibited by law if you do not accept this License. Therefore, by
modifying or distributing the Program (or any work based on the Program), you indicate your acceptance of this License to do so, and all its terms and conditions for copying, distributing or modifying the Program or works based on it.

At least their PayPal unit runs on linux, a GPLv2 software package, and if they have thousands of servers running linux, they’re copying it. As I understand copyright law this is not permitted. What does Skype run on? eBay? What other GPLv2 software do they use?

Is the left hand talking to the right hand?