Cool it, don't jump to conclusions...
... we're all shocked. Friends and colleagues have been lost. Something certainly went wrong, but don't jump to conclusions and call it a case of "shortcuts".
If these guys were rapacious commercial operatives they would have *already* sold tickets and flown paying passengers.
As is, they're developing a technology, from near scratch.
They're on a learning curve, and a thin budget. Maybe in the future all engine tests will be done inside a concrete pit. This one wasn't, and something went terribly wrong.
There WILL be a very substantial investigation. It will take time.
Meantime, wish the injured a good recovery, and the dead a graceful repose...