I don't know...but...when a good developer make a very good VN, has a large following of fans and supporters it even makes public earning per month something like 5k or 20k; or worse case asking for 200 dollars per month aaaaand...after a couple of years it disappears into the oblivion...What should one think if not the worst things in the world?
In what circumstances, a developer abandon a game, only he can tell. So, I will not talk about the abandon game developers whose games were famous and was making a decent earning every month.
I will talk about newbies, just like me.
Let me put myself as an example. I have been working on the game for around 4 months. Did everything I could to make it better... to make the best first impression. If I had written the flashback scene in a few sentences, like... "I was bullied... I misbehaved with my mother... She left a diary... She was not at fault... and I feel regret now..." it would still describe the overall flashback scene in a brief description. But I can bet it wouldn't have touched your heart the way it did.
But if you go to my patreon page, u can see I don't have any supporters yet. 4 months of hard work, in return, nothing but some encouraging words. I have talked with some devs ( their games are at top of the both ratings and earnings right now) and they said, it would take multiple updates. Which means more than an year of work but still then "Might" get famous. The '"Might" will not turn into "will".
That the current situation with many new developer. So, let me ask as a developer... if the role were reversed and you were in their shoes, what would have u choosed to do?
1. Despite the less to no supporters, continue making the game.
Or,
2. Devoting the time to something else which has higher success rate, instead of working on the game for years even without any sign of success.
And give a practical answer.