Because official Xiaomi authorization is strict:
Xiaomi regularly:
Xiaomi monitors unusual flashing activity. Using XAT can lead to a permanent ban of your Mi account. You will lose access to Find Device, Cloud, and Themes. xiaomi auth tool xat
Xiaomi tracks flash attempts. Using a paid XAT service often involves sharing your Xiaomi account credentials with the tool’s server. Many users report permanent account bans, losing access to Mi Cloud and all linked devices. Because official Xiaomi authorization is strict :