I went ahead and exported my account's info from #WhatsApp to see what information they report having on me.

It is an interesting list. Tons of metadata about me. Works almost as fingerprinting with all the information about where I use WhatApp.

What I found surprising (and unsurprising) was that as part of the attributes of my profile it contained the following lists:

• Contacts - The list of phone numbers from my address book that are in WhatsApp
• Groups - List of names of the groups I am part of
• List of previous IP - Probably to detect suspicious activity?
• Very detailed device information - Not just my phone, but the OS and browsers I use for WhatsApp web.

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Information WhatsApp has about you

• User Information ⬅️ Lots about "Me"
  • Report Generation Time
  • Report Request Time
  • Phone Number
  • Name
  • Connection State
  • Online Since
  • Offline Since
  • Inactive Since
  • Previous Connection IP
  • Current Connection IP
  • Device Type
  • App Version
  • Device OS Build Number
  • Device Manufacturer
  • Device Model
  • Web/Desktop Version
  • Web/Desktop Platform
  • Web/Desktop Connected Since
  • Web/Desktop Availability State
  • Web/Desktop Inactive Since
  • About
  • About Set Time
  • Profile Picture
  • Profile Picture Upload Time
  • Contacts
  • Groups
• Terms of Service ⬅️ If I accepted their previous TOS
  • 2016 Terms of Service Accepted
  • 2016 Terms of Service Accept Time
  • Data Sharing Opt-Out
  • Data Sharing Opt-Out Time
  • 2018 Terms of Service Accepted
  • 2018 Terms of Service Accept Time
• Registration Information
  • Platform
  • Network
  • Network Name
  • Device
  • Registration Time
• Settings ⬅️ App settings I configured
  • Last Seen Privacy
  • Profile Photo Privacy
  • About Privacy
  • Status Privacy
  • Blocked Numbers
  • Read Receipts