Participated in a Christmas event hosted by a major exchange. Honestly, this was supposed to be a low-expectation game, but it surprisingly turned out to be profitable.

The logic of the event was simple: guess the cryptocurrency with the highest increase the next day to win an 800U reward, with an extra 100U for the top 30. Sounds good, but there's a practical problem behind it—there are over 400 coins in the spot pool, and you need to flash trade all of them to ensure a correct guess. Each flash trade costs over 15U plus 0.2U in wear and tear, so scanning all of them costs nearly 100U. It seems like a guaranteed profit, but in reality, if more than 10 people do this on the same day, the reward gets divided among more winners, resulting in immediate losses.

So I didn't go all-in; I adjusted my strategy to use the top 10 on the gain leaderboard as a reference. The cost was reduced to around 60U. I only guessed correctly two days, but luck was on my side, and I made it into the top 30, ending up with a total of 140U.

Looking back at the entire event, I found that indeed 3-5 people chose to flash trade all coins. Most days, they could earn over 100U, which is like earning some extra cash through hard work. But this approach is very time-consuming, and the event capacity itself is quite limited—each additional participant significantly reduces everyone's earnings. So I only dare to discuss this retrospectively; if you really follow the trend, you'll probably end up losing money.