Active Collab, who make project management software, have moved their blog (back) from Medium to their own domain. They list the reasons, with conflicts of interest affecting calls to action an important factor, along with SEO:
A blog should build company’s brand and authority, not Medium’s. As such, it should be a part of [the] activecollab.com [website]. We actively write good content and we should be the ones to get the SEO benefits.
The more quality content we have as part of our domain, the greater our domain authority is and the better we’ll rank in search results. We should be the ones to reap the benefits from our work, not someone else.