With that in mind, security and privacy are two completely different things.

For instance, I would say that WhatsApp is fairly secure. It just isn't private at all. Meta can (and does) see and track your meta data.

Why is that important? I liked these 2 examples I read somewhere because they are simple but explain how powerful it is. Your phone calls are private. Your carrier isn't allowed to listen in on your call to know what you talk about. But they can see that you called a suicide hotline while standing on a bridge. They can see that your doctor's office called you and then you called an abortion clinic next. The following week your GPS location went to that clinic. Are these things Person A would willingly tell their phone provider? It's none of their business so I assume not. But they essentially are when they don't care about their privacy.

Another stance I take is that even if they don't care about their privacy, can they at least respect mine? I don't give their phone number out to anybody that asks. But non private apps look at all their contacts so they are doing exactly that to me. Think of the last spam call they got. If they knew it was because of you wouldn't they be upset?