Why won't you lose everything if you don't use take profit and stop loss?

Assuming you never use take profit and stop loss, and you catch a one-sided trend, even if you operate at a god-like level, selling at the highest or lowest point, you make a ton of money! Then one time, a one-sided trend traps you; without a trading system, people don't stop loss. The one-sided trend continues until you get liquidated; no matter how much you earn, that last time wipes you out completely.

This is the power of contracts; it claims to be fair competition, making money through technical ability, fooling gamblers and revenge-seeking crypto enthusiasts into opening contracts, ultimately harvesting them until they lose everything and can't recover.

A crypto enthusiast once commented that you don't trade contracts because you can't make money and lack skills. This sounds quite reasonable, and I can't argue against it. I think there should be a time limit on this; if you can continuously profit from contracts for 1 year or 5 years, with stable returns—not just making a profit and then getting wiped out—that's impressive.

With a 50% rise and fall, if I try 100 times, even with bad luck, I can still succeed once and make money, but I won't touch it; uncontrollable risk is firmly rejected. This is an essential quality for long-term investors.