Will, I'm not so sure. Correct me if I'm wrong anyone, but when it comes to computer linkage, it's 1. public facing IP Address (whatsmyip dot org,) 2. Cookies and Cache, and 3. Super Cookies. If I change my IP address via a proxy or VPN or what ever, clear my cookies and cache with ctrl+shift+del, and erase all flash and silverlight based local storage (super cookies,) but I don't believe this is an issue. If I do those things, I might as well be on a brand new computer.
Well, what other types of linkage are we talking about? Account linkage such as Name, Address, Phone#, Email. And if you want to get very granular here, lets also say password, security question/answer combo, username and email themes (levitikon1, levitikon2, etc,). Excluding campaign info and vouchers, this is the only info that can be linked.
I ran an experiment this morning. Removed all computer linkage and created all new account info. Not a shred of linkage. As far as Bing could tell, I'm an old granny trying to create an ads account with a VCC I bought from SafeWay down the street from the billing address. Banned in 49 minutes.
That's it folks, VCCs are toast. Oh, maybe it was the VCC I used? I tried $15, $25, $50, $100 gift cards Visa and MC. I tried those reloadable debit cards GreenDot (even the AARP ones), PayPower, Paypal, and NetSpend. Oh, and VCCs from my bank too. I think it's official.
-Levi