It’s a good idea to try and keep certain things private.
For example, people have been using anonymous email services for years. These either hide your real email address, or replace it entirely for specific tasks. Folks will go one step further, setting aliases for each service they sign up to. If the mail ends up in the wild? They know there’s a good chance which service has suddenly experienced a breach.
You may well be aware of these methods for anonymising emails. But did you know similar services exist in the SMS space?