[frederikb]

When did that happen? I still have my OG Steam account with an email address as username which is now 19 years old.

I was never prompted to change that, even though I would definitely like to. I would appreciate any insights you might have.

[cinntaile]

I can't remember any specifics I'm afraid, it was probably 10+ years ago. I remember being prompted to change it (either by mail or in the client), I never did and I never logged in either. The account is gone. Since it was that long ago I can't rule out simply misremembering.