This thread is frustrating. Everyone seems more interested in nitpicking the specifics of what OP is saying and are ignoring that a forum sends you your password (not an automatically generated one) in an email on registration.
I’d be more worried if someone who uses the internet to such a degree that they use Lemmy over Reddit, on a programming forum, didn’t get the reference. This is famous hacker lore at this point.
This will explain it for you.