It is complex, but that doesn't mean it's not malicious. Let's use a simpler example.
Sam runs a horse racing operation and allows you to place bets on horses. Before the race begins, Sam collects $1,000,000 from various people placing bets on the race. During the race, Sam runs across the street to the casino and puts the $1,000,000 he's holding on black at the roulette table. If he wins the bet, Sam plans to take the $2,000,000 back, pay off customers at his race track, and then walk away with an extra $1,000,000 in his pocket.
Unfortunately, it comes up red, and Sam walks out of the casino with nothing. Realizing he won't have money to pay his customers back, he tries to find someone who can buy his race track and take on the debt, but nobody wants to inherit a $1,000,000 debt.
This is malicious. Sam willfully defrauded customers. Yeah, it could have worked out, but it didn't, and nobody consented to risking their money on the roulette table.
Now change $1,000,000 to $10 billion and replace "race track" and "casino" with complex finance mumbo jumbo.