One of the biggest drawbacks of using Medium for business purposes is its lack of support for link building SEO efforts. Any outbound links by default carry “rel=nofollow” attributes, which poses two problems, the first being that all of your hard work is contributing to Medium’s authority score, not your own domain, and two, link building efforts are not possible. As a result, your content will only be as valuable as the traffic that is driven to your website by clicking on outbound links. I'm not saying that this limitation is ineffective in helping gain organic reach, but it severely limits the shelf life of your content and provides no help in growing your domain's SEO efforts.

Beyond the issues with the platforms SEO capabilities is its terms of service. I don’t believe that the team at Medium ever plans to do anything nefarious with your content, but their terms of service states that they are free to use your content in any manner that they would like (Medium Terms of Service).