They did a 51% attack to mine more than one block so it was irreversible. Dev 1 posts a sell 11 SYS for 96BTC and Dev 2 (or investor) buys from Dev 1. All the orders in between fucked the bots. Bots continued to buy expensive SYS setting much higher floor. Total cost to scammers, around 30 BTC. Profit, could be as high at 7k BTC. Genius but highly unethical. And that's crypto for you