Just because some people have been turning their page, way to, pink (with the Firefox ‘nofollow’ indicator plug in installed) that is not a reason to devalue something that is OK to do. It would not of been that hard to plug in a change that would pick that up as spam and therefore put a ‘trust’ question mark against sites that have been ‘nofollowing’ everything.
A breadcrumb is a row of internal links at the top or bottom of the page that allows visitors to quickly navigate back to a previous section or the root page. Many breadcrumbs have the most general page (usually the root page) as the first, leftmost link and list the more specific sections out to the right. We recommend using breadcrumb structured data markup28 when showing breadcrumbs.