Code snippet that can be used to remove title block for a certain page in Drupal 8.
/**
 * Implements hook_block_view_alter().
 */
function mymodule_block_view_alter(array &$build, \Drupal\Core\Block\BlockPluginInterface $block) {
  if ($block->getBaseId() === 'page_title_block') {
    // Remove the title block from the front page.
    $is_front = \Drupal::service('path.matcher')->isFrontPage();
    if ($is_front) {
      $build['#access'] = FALSE;
    }
  }
}