Do I need a privacy policy and account deletion in my restaurant app?

Yes on both stores. Apple needs a privacy policy link in the app and in App Store Connect, and in-app account deletion if people can create an account. Google Play also needs a web link for deletion requests.

• Apple privacy policy: link it in App Store Connect and inside the app.
• Apple deletion: if the app lets people create an account, it must let them delete it in the app.
• Google Play deletion: in-app account deletion plus a web link where deletion can be requested.
• Fewer logins: Apple says apps without significant account features should let people use the app without logging in.