WKAppBoundDomains was introduced in iOS14. That is not allow evaluate Javascript, touch cookie storage or more without selected domains. I know this is for privacy and security.
When it was introduced, I thought it will become default behavior in WKWebView. Doesn't WKAppBoundDomains become by default in iOS15? if not, is there a plan to enable WKAppBoundDomains for all WKWebViews?