Be suspect of any centralized, closed service attempting to replace an open, working, eco-system of decentralized platforms.
To be honest that's the biggest reason I have never really rooted for Signal. Even though it's like really beta, I would rather invest my hope and efforts in Matrix/Riot kind of setup.
Medium tried to act as if it were something a little bit better than the rest of the web and it quickly became something just a little bit worse.
Why?
If you are running a tiny service you can get together a community of people who are two or three standard deviations better than the mean.
If that service grows, it is going to tap a wider pool of lesser talent and the quality of the discussion will decay.
Hacker News has fought this, but Hacker News is not funded the same way as the firms that Y Co invests in.