I publish to multiple! (My own site, SquareSpace, and here and Medium).
Your own site/wordpress gives you full control. Medium gives you exposure if you can get into a publication like HackerNoon. But Dev.To gives you tweets to thousands of followers and a hella amount of warm fuzzies from the community.
We're a place where coders share, stay up-to-date and grow their careers.
We strive for transparency and don't collect excess data.