Yep, you're right. I was curious about your project but as it hasn't launched yet and I wanted to make something on this weekend, that's what happened. I don't see a problem here to be honest. ;)
It didn't just happen - seems like you have intentionally copied someone else's idea, down to naming and design. You're obviously entitled to do so, but it's not something I would run bragging about on hn, especially without giving any credit the original work.
And saying "I don't see a problem here" after the original creator has pointed (quite gently) to the fact, is not very empathetic of you.
And I wasn't aware that anybody owned the space.
Good for you.