Allow all IAC attendees to view protected content

example.php

<?php
// Allow all IAC attendees to view protected content.
add_filter( 'tribe_tickets_shortcode_can_see_content', static function( $can_see_content, $filter_args ) {

    // Only run our logic below if the user is logged in or if they cannot currently see the content.
    if ( ! is_user_logged_in() || $can_see_content ) {
        return $can_see_content;
    }

    // Get the logged in user.
    $current_user = wp_get_current_user();

    // Define query args as empty array by default. 
    $args = [];
    
    // If specific tickets are defined in the shortcode, add query args. 
    if ( isset( $filter_args['ticket_ids'] ) && ! empty( $filter_args['ticket_ids'] ) ) {
        $args =  [
            'by' => [
                'ticket' => $filter_args['ticket_ids']
            ]
        ];
    }

    // Get a list of attendees.
    $attendees = Tribe__Tickets__Tickets::get_event_attendees_by_args( $filter_args['post_id'], $args );

    // Loop through the attendees.
    foreach( $attendees['attendees'] as $attendee ) {

        // If current user is one of the attendees, show protected content. 
        if( isset( $attendee['holder_email'] ) && $current_user->user_email === $attendee['holder_email'] ) {
            return true; 
        }
    }
    
    // No attendee matches.
    return false;

}, 100, 2);