Again, why? Nothing on its wiki article or the first page of Google results suggests it should be a household name.
So unless the default assumption is that everyone on HN is dating (I'm married) I genuinely don't understand why it's weird to not have heard of some random ass dating app
Because it used to be the "best" dating app out there for "serious" people wanting long term relationships. Now all the apps are trash and have predatory monetization.
Even if you're married, you've got to know somebody who isn't. It's like referring to Google as "some random ass search engine website" and wondering why people think you're the weird one.