The big shot who live-streamed a full position of 80 BTC also took profits and ran. Why is that?

Those who trade have certainly heard the saying 'cut losses short and let profits run,' but in actual trading, we often do not follow this adage, and sometimes even act contrary to it.
We once conducted a data analysis investigating what happens to a large number of futures accounts from inception to demise.
Statistics show that the vast majority of futures accounts have a lifespan of 3 to 6 months. Further statistics on these accounts' trading indicators reveal that most accounts have a high win rate, with some extreme cases reaching over 90%, yet they ultimately leave the market at a loss.