Tipjoy cofounder here. "joy" is a three letter word that is incredibly positive. To come up with the name, I wrote down every word that was about money and pa

Tipjoy cofounder here. "joy" is a three letter word that is incredibly positive. To come up with the name, I wrote down every word that was about money and payment, and every one about happiness, and tipjoy was the shortest combo. I bought it for $8. The reason you see so many now is that these characteristics haven't changed.