Change WP Bouncer limit based on user's membership level.

my_wp_bouncer_number_simultaneous_logins.php

function my_wp_bouncer_number_simultaneous_logins($num) {
  
  // Bail if PMPro not activated or function not available.
  if ( ! function_exists( 'pmpro_hasMembershipLevel' ) ) {
    return $num;
  }

  if ( pmpro_hasMembershipLevel( '1' ) ) {
    $num = 1;
  }

  if ( pmpro_hasMembershipLevel( '2' ) ) {
    $num = 999;
  }

  return $num;
}
add_filter('wp_bouncer_number_simultaneous_logins', 'my_wp_bouncer_number_simultaneous_logins');