Perhaps the author of the game you specified is only engaged in it and does not work.
We only know what the author tells us in Ci-en or Patreon. Perhaps Fujino is just a lazy bastard who sits on the money from donations and pretends to work or be sick. But in fact, it just stretches the game to get more money. Or maybe he works 12 hours a day, with one day off a week. We don't know how it really is.
Although I personally know one author from Patreon and I can say that most likely Fujino is a lazy bastard.

