My grandparents’ generation and my parents’ generation aren’t about to invest any effort into learning a new app. They’re happy with Whatsapp, it was the first to do what it needed to do easily, and unless a new app offers a compelling new feature, they’re not going to find it worth their time to learn it.

Unfortunately, they might not understand privacy concerns, but even if they did, they don’t have the language fluency or technical capacity to verify the claims of security.