Breadcrumb >> no links

well a quick and dirty way is to make them not clickable in quick css:

.breadcrumb {
  pointer-events: none;
}

but in the DOM the a-tags and all href are still present.
to change all settings in class-breadcrumb-trail.php and class-breadcrumb-legacy.php and have child-theme substitutes is complex and – on parent theme changes in those files you had to think of reproducing that changes.

a jQuery solution could be to change a-tag to span-tag and remove the hrefs – please try in your child-theme functions.php:

function breadcrumb_links_to_span(){
?>
<script>
(function($) {
  $('.breadcrumb-trail span').css('float', 'left');
  $('.breadcrumb ').each( function() {
    $(".breadcrumb-trail a").replaceWith(function(){
      return $("<span>" + $(this).html() + "</span>").removeAttr('href');
    });
  });
})(jQuery);
</script>
<?php
}
add_action('wp_footer', 'breadcrumb_links_to_span');