Because I'm not a sociopath. In this theoretical happily-ever-after dating app, I want to make people happy by connecting them with the right other people. Ongoing business comes from happy couples giving word of mouth recommendations to their friends and family, not from trying to lock in a misery subscription.
Maybe I'm old fashioned. I remember a time when capitalism meant "make money by doing something helpful for people" instead of rent-seeking bamboozle profits.