“That some big-name apps have removed their Apple Watch apps isn’t a sign that the Apple Watch is failing as a platform: It’s a sign that the platform is evolving [as developers learn what the new form factor is truly useful for]”
https://slate.com/technology/2018/04/apple-watch-popular-apps-are-leaving-the-platform-is-that-a-bad-sign.html
It joined Twitter, Amazon, Google Maps, and Slack, among others.