What I always wondered about is why the (good) people that publish free content on Medium actually publish on Medium. I mean, talking of technical article/tuto

What I always wondered about is why the (good) people that publish free content on Medium actually publish on Medium. I mean, talking of technical article/tutorials, it is not like nowadays (and in the last - say - 10 years) there are not other ways (personal site/blog or if the issue is expected huge traffic other free hosting sites, like - still say - github). What is the perceived "added value" by Medium (in case of free content)? Better visibility?