There simply wasn't enough plot to fill 10 episodes so they supplemented it with a bunch of silly twists that did not pay off at the end. The answer to most of the questions set up through the series was basically "just because." It would be much better to keep focused on just a few mysteries instead of constantly jamming in new twists to stretch out the story.
There are too many ridiculous plot points to pick apart one by one, but man, is it ever easy to become an ultra powerful billionaire in this universe. Both a sweat shop factory worker and a pennyless single mother managed it due, apparently, to determination. Same with creating a global clandestine criminal network.
And worst. Mother. Ever.