pmpro-member-directory-hide-email-address.php

<?php
/**
 * Hide the email address from the member directory.
 *
 * You can add this recipe to your site by creating a custom plugin
 * or using the Code Snippets plugin available for free in the WordPress repository.
 * Read this companion article for step-by-step directions on either method.
 * https://www.paidmembershipspro.com/create-a-plugin-for-pmpro-customizations/
 */
function remove_user_email_address_from_member_profile( $value, $original_value, $field_name ) {

	// Add the email addresses you want to hide here.
	$remove_email_addresses = array( 'johndoe@example.com', 'janedoe@example.com' );

	if ( 'user_email' === $field_name && ( in_array( $value, $remove_email_addresses ) || in_array( $original_value, $remove_email_addresses ) ) ) {
		return ''; // return empty string to hide email address
	}

	return $value;
}
add_filter( 'pmpromd_format_profile_field', 'remove_user_email_address_from_member_profile', 10, 3 );