Yes, developers are able to leverage WKWebview on iOS and a Webview on Android.
One thing about both webviews is that there are callbacks with these implementations that developers can choose to open a link in the embed webview or not. It might be useful for privacy/security for Apple/Android to force developers to allow-list a domain (like iOS's Associated Domains) or such that an embedded webview can load (besides local html and files). It might be something in addition to the developer's callback.