Also, I believe this is related to a legal precedent against ad-blocking in China (https://adguard.com/en/blog/china-blocks-ad-blocking.html https://adguard.com

Also, I believe this is related to a legal precedent against ad-blocking in China (https://adguard.com/en/blog/china-blocks-ad-blocking.html https://adguard.com/en/blog/china-blocks-ad-blocking.html), which AdGuard notes that is ironic given that UC Browser has adblockers.