> You personally might not care about this privacy intrusion but the people you are messaging never consented to this.

The world always worked like this though, as soon as "data" is shared out from your head to the wider world, it has "leaked" and can no longer be considered secret. This was as true 100 years ago as it is today. The only secrets that can be kept, remains the ones you keep inside of your head and don't share with others.