After I decided not to build PingPing in public anymore, I decided to build a commercial product.
So I spent the next time developing PingPing. I didn't stress myself out. I developed when there was time. So it takes a few months until I finally had a product that I was satisfied with.
I sent an email to all subscribers who wanted to participate in the Private Beta. More than 50 people signed up. I selected 8. It's really hard to get testers who are reliable. Most of them just want to have a lifetime license for free.