I've been building Imprint (https://imprint.to) these past few months to provide a better home for ideas. It's centralized like Medium, but has a focus on content ownership. You can use custom domains, own your content through our policies, and know that your content won't be altered or removed spontaneously. We also promise that in the event of the platform shutting down, we'll notify you to export your posts 3 months in advance.