They have never said otherwise and I know Mari isn't the artist so there are still at least 2 but until told otherwise i'll take it that all 5 are still there.
Even so, they are either earning 20 dollars a month each or 50, it's still not enough to accuse them of milking, not when finishing the game could get them thousands.
Free income still is free income. If it doesn't require any effort nor work to be gotten, it's always good. Also, since they have burned all their funding, they would need to raise their own, there's no way to tell the investment return ratio, especially with tarnished reputation. So the assumption that they'll have thousands of profit, could be extremely misleading and actually result in thousands of money loss.
If there was 5 people still working, this game would be finished by now. There simply aren't 5 employes on this project.
Y'know, one doesn't need to make 1.000.000.000 a month from doing nothing in order to be considered a scam.
A scam is not about the amount of revenue received, but the act of being misleading/cheat and manipulate people.
If someone makes a promise or a claim, but don't deliver on it, and still keep receiving, then it's a scam. 1 dollar or 1 million doesn't matter.
Besides, even if that's not the intention (then why don't the creator put their own money?), that lead to the conclusion of incompetent resource administration. This also lead to the conclusion that this game won't be finished, or at very least not with the same level of quality initially put.
In the end of the day, if it's a scam or cheer incompetence, both lead to the same direction and resolution.