15k a month and its one guy?? jesus christ this game made him stinking rich. I should get into porn game development, what the fuck..
There are a lot of games with only one devloper and low content updates,but they have a lot of subs. Luck and skills both are a factor of your success. A good combination of both will get you anywhere. Or you can just make a NTR game and get a shit tone of money😅.
But as I said,this is a side project where he practices his game making skills in unity engine ,but his main project has a team for the devlopement.