The problem is that ordinary people are replicating the strategies that professional traders use, without realizing professional traders bet other people's money, keep the profits, let their customers eat the losses, and reboot at-will with fresh "other people's money" when they go bust.
The "norm" (average) for money managers can be achieved by having half the money managers lose money to the other half. This works well for them, because when they win they win, and when they lose someone else pays. Money managers can go big or go home, and keep trying, because in the long run they're not eating the losses.
But people betting their own money on the same strategies actually lose their own money when they lose.