Ditto, but you'll have more luck with Signal. They'll see the value of it more quickly. I'm currently trying to get 3 people to use Keybase.

My girlfriend/fiancee: Lives in another country, we're sharing data involving PII to deal with immigration stuffs.

My sister: We have a side project and I'd like to use the team based, private git repos.

A colleague: Same as sister, plus he's generally interested in privacy/security. And it's still been like pulling teeth to get him to do it.