Medium allows you to freely link to your own site(s) in your profile, which is featured next to all your content, so you definitely make a good point about this

Medium allows you to freely link to your own site(s) in your profile, which is featured next to all your content, so you definitely make a good point about this. There's a happy middle ground that a savvy digital writer can find which will provide them with the advantages of a centralized platform like Medium without subjecting them to the risks of only using Medium. If they provided an API that let you syndicate your content from your personal publishing site (Wordpress, etc) into Medium, then they would increase the incentive to publish there even more.