I am surprised that is the first pitchfork post so far...
Your post is troubling too.
Because of some trolls you advocate screwing over supporters and investors?
The situation is, the developer stopped communicating a month ago, he has logged in but ignored all questions. Meanwhile, the project is not finished.
A single update or post saying 'I am on vacation' would have saved the price and project. No one is asking 24/7 anything...
By abandoning the project, he is not just screwing the "self-entitled, self-indulgent brats who deserve the life lesson" as you spouted. (did you shake your fist when you said that?)
He is also screwing the cool people that helped and supported the project, the people that advertised and tweeted, and the people that invested time and money for the last few months.
But, you are correct they are technically not "scamming" anyone, they are just actively SCREWING everyone by abandoning the project.
You can have 1¢ back.
I have seen this happen with many coins (and I have followed over 100 projects so far). Exactly the same, except for the partially closed source.
Apart from scammers, there are many devs who work on multiple projects, and they decide to give their best attention to certain ones. The others eventually get ignored because they still want to keep a finger in the pie, and aren't ready to tell the community.
There is also a 'Dev syndrome' where the workload and demands (and abuse), over a period of time cause a mental instability to manifest itself in strange ways.