Rental of expert advisors via trade copiers

Good profitable EAS are not sold, the owners of the EAS will usually rent out the eas , for a monthly fee .A good profitable ea can be worth millions of dollars, because some major bank like Goldman Sachs can charge billions in fund management, they can find investors for trillions of dollars.

https://www.cnbc.com/2017/11/11/the-20-percent-club-hedge-fund-stars-of-an-industry-rebound.html

Good profitable eas are worth billions $ in profit.Nobody is going to sell a profitable EA.The renter gets a trade copier EA , to copy trades from the expert advisor renter, it copies the trades of the profitable EAS.