It is people like you and parent that make "Don't Read the Comments"[0] relevant. This company just launched and it's perfectly fine to introduce and "advertise" the products you make even on Hacker News -- particularly newly launched startups addressing a common need.
You seem to know nothing about the problem this company is trying to solve, or at least you chose not to share any usable information. You both read somewhere between 1-2 lines of this post and decided to chime in with your completely unsubstantial opinions.
You contributed nothing and did nothing to help the founders improve.
The article says that the reason for lower fertility rates are people waiting to have kids later.
Lower individual fertility from age only happens as you trend toward 40, so there's nothing teenagers and 20 year olds should be planning outside of "maybe have kids at 30".