Sorry guys. My bad. I worked for Citi a few years back. After we bought the Sears Credit Card and all it's receivables, our legal team instructed us to close several million Sears accounts because they had been inactive for a number of years and we could no longer consider them "customers" in a legal sense.
We came up with a different idea.
Lending laws allow a credit card issuer to issue a customer an alternate card if the customer stops using one (it's called "migrating" an account in the credit card biz - and again, it's all perfectly legal). Before that card can be issued, an opt-out letter must be sent, along with all new interest rate and terms disclosures. If a person doesn't respond to that notice, the new card is issued and sent out.
So instead of closing all these accounts, we ran credit scores for them, and started the process of issuing new cards (the Prism Card) to those who were credit qualified. The terms on Prism were pretty good - low base interest rate, a true 6- or 12-months "same as cash" offers, cash incentives for spending $X on the card during the first few months. It was actually a very desirable card - for those that read the opt-out disclosure info. It was wildly successful - we reactivated a whole lot of accounts for not very much money. And a lot of people loved the new card - but obviously not all of you...
I left Citi in Jun 2006 and at that point the first mailing had been out for about 9 months. The balances on the Prism cards were way higher than we'd forecasted. The credit quality was all very good. And Citi had found a way to reactivate millions of accounts that it had acquired in the 2000's from a variety of card portfolios, including: Sears, Home Depot, Macy's/Bloomingdales/May's/Marshall Fields, Texaco/Chevron/BP/Amoco/Citgo/most other gas cards, just about any jewelry store that has a credit card, Office Depot, Office Max, Staples, etc. As cards neared the threshold that Citi's lawyers told them they needed to close an account due to inactivity, they "migrated" them to Prism instead. If they still didn't activate, the Prism account eventually got closed as well. But the good terms and bonuses on Prism made it an attractive card. Lots of people used it. And we got lots of calls from non-Citi-customers asking how they could get one. But they couldn't. You had to be a Citi customer with a long-term inactive card and we had to make you the Prism offer. Don't call us, we'll call you.
That's how the whole thing worked. And it was all my doing. And I assure you, it was all perfectly legal. Sorry about the confusion...
BTW - I have no idea if they're still doing Prism. Everyone cut credit issuance a lot in 2008. I haven't talked to anyone back at Citi about it since about that time...