This adds to the concern. They were a UK registered company with a fake director. They just established a new company (yes it is that easy to do) and carried on. They don't actually use the company to process any profits I'm sure. It just adds a veneer of respectability to the enterprise.
As long as bitcoin goes up in price, they will keep paying out. If bitcoin stops going up...........
But if you do the maths you are much better off just holding bitcoin rather than investing. I put a token amount in and although they still pay out as stated, I would have been approx 200% better off just holding bitcoin.
My advice is not to bother, just buy and hold bitcoin if you are thinking of investing. You'll be much better off in the long run.