I see that the app lets workflows create their own apps on the home screen. I wonder if this had something to do with it? My thought is that it's a web app with a scheme to open a specific workflow. I bet Apple didn't like that.
The way it lets workflows create apps, is that it creates a data url, that it opens in safari, and l has you bookmark that URL to your home screen. When opened as one of those safari web apps, the javascript on the page auto clicks the only link in the page - one to a URL formated like this: workflow000000://x-callback-url/run-workflow?id=HEX, and bounces you into Workflow
<10 minutes of playing around with the workflowFEC418 url scheme>
Well darn, it looks like you can't. That's crummy. I thought I could get clever with `history.pushState`, but that doesn't let you change the URL scheme without a security error. It looks like this is the best way to do it on iOS.