I'm also wondering if it's an automatic classification. Wouldn't expect that on HN, but the posts in there are so random that it almost must be.
As for that specific comment, to be fair, I could actually understand: promoting your own product in someone else's thread without really saying anything at all about the submission (topic) that was posted could be seen as off-topic. I don't really mind it (I don't think I voted on it), but I could see a human also classify it that way
Yeah , that's fair. More than promotion i was trying to suggest i had also built something similar and kind of understand the product space. It's this dev thing, can't shake it off i guess. But i get what you meant.
Apart from that i have a theory that there is a lot of ML based ranking and classification that is happening at the backend.