Statistical arbitrage trading strategies and high frequency trading
Not to mention that Trump speaks positively about his rent seeking, not like it was a necessary evil. Do you think people like Bill Gates or Henry Ford or Carnegie and the like before him got ahead by just working hard and providing a superior product.
Fuck no. Most people who get ahead get there by working their ass off, getting lucky, and at some point doing a few things they didn't think they would do. If you want to keep your morals, go join a monastery or turn a wrench nine to five.