Chinese Showdown utilize the following privacy-sensitive permissions for the following reasons:
When you login with a Google account in the app, Chinese Showndown will send your email address to the servers of Nilsen Labs in order to identify you as a user. Nilsen Labs will not share this information with third parties.
If you use the screen-capture share functionality, the screenshot is only temporarily stored on your device before shared. It is never sent to the servers of Nilsen Labs. Chinese Showdown does not use the Photos/Media/Files permission for anything else.
Read more about android permission here
Chinese Showdown at Play Store