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Amazon did this for a long time. I don't know if they still do.

• itsnotlupus 6y ago
  They do. I used that "feature" by accident recently. I think one of the accounts was a shopping account, the other started as an AWS account. Both accounts have the same name, same billing address, same credit card. I think the logical next step is to give them the same password and see how bad my foot hurts afterwsrd.
  • toast0 6y ago
    I did this in the past. Aparently I forgot I had an account, setup a new one, then found my older account, after some email migrations, they ended up on the same email with the same password. I think it was pretty consistent about which account I logged into, but changing the email (or the password, I guess) of that account let me access the otherwise hidden account. They still have no merge feature, but at least they let you change your email address, unlike some sites.