Unfortunately, anytime you depend on a third party whether it be Google, Amazon, Facebook, etc., this is the exact risk you take. Don’t feed the dragon.
Build for another platform or build for something other than mobile devices.
Ok that is out... so what is the other platform?
You can't even work around that problem because Apple bans any other browser or scripting engine from being distributed on iOS, so users are stuck with an intentionally limited browser for web apps, which makes web apps second-class citizens on the platform.
I attended an event that had mobile food ordering and they actually promoted "No need to download an app. Just order online at food.example" and you got a nice mobile optimized web site.