But I shared this here not because I thought we will get clients from HN (probably we will be getting some competition instead) but because I thought it's an interesting application of technology that people would enjoy reading about.

Maybe we don't see things the same way but even learning about the manual process of counting pearls was interesting for me.

Seems like a pretty poor ad in that case -- they are advertising a profitable business sub-niche to a huge audience of engineers, many of whom have the knowledge, execution, and money to build a clone service and drive down margins.

And... I could probably build something like this. Not as nice. And not in four hours. It'd take more than four hours of meetings to get it started. The app's price is well worth it, if we can work it into our processes.