Thanks. This is a really good information!!

Do we have solution or know what risks we run into when we need to show WKWebView on launch?

We are facing the same issue with Blackberry Dynamics Framework. We have opened an issue with Apple and they acknowledge they are looking into it. The problem is they have been looking into it for more than 15 days now!

We are facing the same issue with today's submission. Is this really resolved for all cases? ITMS-90338: Non-public API usage - The app contains one or more corrupted binaries. Rebuild the app and resubmit.. If method names in your source code match the private Apple APIs listed above, altering your method names will help prevent this app from being flagged in future submissions. In addition, note that one or more of the above APIs may be located in a static library that was included with your app. If so, they must be removed. For further information, visit the Technical Support Information at http://developer.apple.com/support/technical/