I think the parallel is that people don't click on a link to send an email to someone for the first time. They copy and paste an email address into the "To" fie

I think the parallel is that people don't click on a link to send an email to someone for the first time. They copy and paste an email address into the "To" field of their email client. Same thing with getting someone's number to send them a text. And they know that people use different-looking email programs to read their email. Many people use the iPhone mail app on their phone and web mail on their computer. They don't know the word "federated," but the differences aren't alien to them.