Trust erodes when data sharing is careless and opaque.
We don’t trust Facebook anymore because we learned that they gave away our data way too carelessly. The real issue isn’t about who has access to our data, but rather what the data is actually used for. Since we don’t know what happens with our data once Facebook has it, trust has eroded. The outcry over WhatsApp’s updated privacy policy, which disclosed data sharing with Facebook, reflects this deeper mistrust. It doesn’t matter what Facebook does at this point because the trust is already broken.
— WhatsApp: We Should Discuss What Our Data Is Used For, Not Who Has It · Forbes