I see. Thanks for the correction. I had no idea the account name was a private identifier that was completely separate than the public username. I thought the profile name was just a displayed thing and you still needed to add someone via their username.
So I haven't read all 30 pages that I missed during the day, but I saw the edits to the OP claiming there was no evidence of compromised CC info. So what's with the people saying they had suspicious transactions on their credit card? Unrelated, or Valve giving us BS platitudes?
I'm not aware of any substantiated information of unsolicited purchases on compromised Steam accounts. From what we've been told by multiple credible sources, including Valve, is this should be impossible.
Financial institutions are slow, especially around the holidays. My guess is, people purchased some games over the course of the sale, checked their bank, and then jumped to conclusions when the deduction showed the 25th.