It's obviously not a security problem or a harm when used by an open source file synchronization app, and Google is being unsophisticated with its policy here.
(btw, not singling out Google - IMHO Apple is bad here too. This duopoly in the smartphone space is a major PITA)
https://www.bleepingcomputer.com/news/security/apps-with-15m...
https://www.zdnet.com/article/phantomlance-spying-campaign-b...
https://www.welivesecurity.com/2023/05/23/android-app-breaki...
There are also examples of apps using the filesystem to try to detect rooted devices, an invasion of user privacy:
https://www.reddit.com/r/Android/comments/g6cdl6/apps_have_a...