Not really disagreeing with you, but every smartphone app that has access to your contacts also violates your contacts' privacy. WhatsApp, FB, Google Auto, etc, etc. More than anything, I hate the way this has been allowed as an acceptable practice.
https://f-droid.org/en/packages/opencontacts.open.com.openco...
Unfortunately, it's not always so easy to not share contacts with certain services. For instance, WhatsApp works just fine with a telephone number but it actively encourages users to upload their contacts - assumably consumed by (the) Facebook (group of businesses) as part of its social graph.