If you were using nofollow to block any sensitive areas of your site that you didn’t want crawled, it probably makes sense to go block these in a different way,” Patrick Stox, technical
SEO and brand ambassador for Ahrefs, told Search Engine Land. There are various ways, such as robots.txt or meta tags, that you can use to regulate how Google crawls and indexes pages. As for the UGC and sponsored attributes, implementing them is voluntary. If you want to provide Google with that information (and have links classified for your own reference), feel free to do so. Whether you do or don’t won’t impact your site.