I wish there was a viable workaround, but the simple answer is "no" unfortunately. What's triggering the browser invocation is a system-level intent, and basically any app is allowed to open web browsers using the default protocols from anywhere, similarly to being able to e.g. trigger a phone call request, open the app store, or invoke a calendar. Your default browser gets launched to the foreground by the operating system, and only after waking up it's passed the target links etc. — so even if there was some extra filtering on the browser side, it would always end up opening anyway, as it's just being invoked by the iOS at that point without knowing anything about the kind of content or the opener game :(