I would give this ten thumbs up if I could. I thought exactly the same thing upon reading it.
It feels a lot like a Ponzi scheme. The problem with those is their dependence upon continual growth to stay out in front of the 'interest' payments to 'investors'. These guys are probably banking on there being a perpetual market for the high-yield bonds they appear to be funding the whole thing with. The SEC will let a company make private debt issues without the usual accounting scrutiny that accompanies participation in US capital markets. In essence, the law says that whale investors chasing high returns without the standard sureties can be assumed to know the associated risks.
If 777 is a money laundering front, odds are that market isn't going anywhere unless they get caught. If not, the problem is that if their businesses get killed in a downturn, that will quickly become obvious to any external observer. The market for their bonds will dry up, they'll get stuck in a liquidity crisis due to the leverage and they'll go under. It's what broke Donald Trump's businesses, along with loads of other people, in the early '90s once the junk bond boom hit bottom. He couldn't stay in front of the huge interest payments on the bonds for the Trump Taj Mahal, and ran out of takers for debt issues to keep the light bill paid.