Is the recommended film safe? Why is it always judged to be risky by the mobile phone system?

Not safe. Because recommended movies often carry other viruses and Trojan horses. During your installation, the software will apply for many permissions, and some people will give all permissions regardless, but your privacy has been leaked. These softwares often have a background, which will steal your address book and SMS records, and even secretly call your camera in the background to peek at your privacy. Even some lawless elements will use this as a threat to conduct online fraud.