It should be that BTC has risen too high, Binance doesn't want to give out BTC anymore, and doesn't want to admit it, so they let the director win in advance, and then just offer a slightly lesser reward to brush it off. The rules are not important.

This is a general announcement, and the products and services mentioned here may not be applicable to your region.
Dear user:
Thank you to all users for your enthusiastic participation in the 'Binance 8th Anniversary: Finding Koi' event! Due to the event's overwhelming popularity, the 'Super Koi' winning user was lucky enough to be selected on the first day of the event.
Announcement of the winning user for 'Super Koi':
Winning user UID: 65***454
Winning time: July 14, 2025, 08:14:10 (UTC+8)
In appreciation of the support from users for the event, we will add an extra 'Binance Koi' grand prize to the original prize pool!