If a random guy can make the app then Spotify could certainly have made an Apple Watch app.
If anything it makes the case that if it were so simple for a single random dev that unless Apple itself were preventing it there is no reason the app wouldn't have been released.
For god sake, it's about policy not tech inability!
You don't even need to read the website to know that. WatchOS has APIs like iOS, it's not a matter of being 'hard' to program. It's because if you're nobody, the spotlight is not on you every step you take. But Spotify being your competitor is being close watched.
But it was Spotify that asked the random guy to take the app down. If anything I would have thought it would be in Spotify's interests to keep it up - "look it's possible, but Apple isn't allowing us"
Of course, because this guy had no rights. It’s already technically possible without having to keep an app alive that’s infringing your property just to say ‘hey look’
If anything it makes the case that if it were so simple for a single random dev that unless Apple itself were preventing it there is no reason the app wouldn't have been released.