It can be coming from Carrd—a application for building a single-page websites. They appear to be listing all the email tools they combine with proper on their own homepage, and Convertkit is one of them: Not all backlinks are made equal, and high-quality kinds tend to be more worthwhile. https://zanderqdrcs.bloggazzo.com/28014986/5-simple-techniques-for-buying-backlinks-for-seo