Boosting—having someone else play the game for you—is an unfair practice.
To tackle this issue, after 24 hours have passed from the beginning of an event, any players that rank in the top 300 even briefly will be limited to a maximum of two account transfers.
The limit will be removed after the event ends.
This applies to any account transfers, including those made between accounts on the same operating system, those made between accounts on different operating systems, and those made as backups.