Absolutely yes. Whenever we give permissions of any smartphone resource like gallery, photos, media, camera, contacts or messages, it means that we are providing a complete access rights to the app to modify and copy all the stuff.
But the good news is that new android updates allows us to disable these permissions later on by going to our Settings and Apps.
I hope this might help you in disabling the app permissions
How to disable App Permissions on Android 6.0 and above
Youtube Video Title: Easily Manage App Permissions on Android 6.0 and above
Channel: Ricardo Gardener