Yes, if private-ness of the conversations is a selling point for your app, your target market includes mostly of people who are concerned about how their data is being collected/used. By asking to access to pretty much everything that you can on Android, I dont see why people might install this app.
I hope this helps:)
For security design, do you mean encryption? We do TLS encryption of the messages once they leave the device (similar to most other messengers). Do you think we need to somehow provide this information to user?
Hello, I understand your situation. You may want to try Serkit Messenger as it support both public and private chats simultaneously. With Serkit messenger, you can make any of your chat private just by click of a button. Android and iOS links below:
COuld you please provide little more details on your comment?
What do you mean by lack of security design? Are you suggesting, the app needs to ask for less permissions during install or during the operation?