Why does integrating with MailChimp require every new lead to receive an ugly confirmation email?

Example:

Title: MailChimp List Name that I Don’t Want Exposed to New Leads

Your subscription to our list has been confirmed.

For your records, here is a copy of the information you submitted to us…

Email Address: example@myurl.com

First Name: (first_name)

Last Name: (last_name)

Company:

If at any time you wish to stop receiving our emails, you can:

unsubscribe here

Big MailChimp Unsubscribe Button.

You may also contact us at:

example@myurl.com

/Example

When setting up the MailChimp integration, I selected “Welcome Email” rather than “Confirmation Email” which sends a double opt-in.

My intention is to send my own custom “Welcome Email” and not use MailChimp’s ugly confirmation email.