I waffled on tagging this satire, but the code does exist and (to my ignorant skimming) looks like it does what it’s supposed to. The only thing different between this and most ICOs/DAOs is the added honesty.
That makes it an extra-high quality satire :P
Looks like there might be a theoretical bug, though: after your first investment, future investing is added to both your investing and current balance. So if Alice and Bob each have fifty ethums invested and Bob invests another 50, he’ll immediately get 25 of those added back to his balance. But now he’s 2/3rds invested, so if he immediately reinvests the 25 he gets 16 back and is at 72% invested, then he can repeat etc.
I say “theoretical” because of the 50% haircut each time.