Is there any chance someone was cleaning up your laptop/backing up IP and simply forgot it would be signed in as you and not them? A simple "thanks" on a public

Is there any chance someone was cleaning up your laptop/backing up IP and simply forgot it would be signed in as you and not them? A simple "thanks" on a public thread is ambiguous enough that it's not obvious which comment they'd be replying to. Posting from your account accidentally would likely be fine, legally. I don't have any idea about the law if it was intentional, though.