If Johnny Nobucks makes an illegal broadcast using an Apple device - or rather if Johnny Nobucks makes an app for the express purpose of doing the illegal broadcast, and distributes it to 1 million other users on Apple devices — the FCC equivalent would faaaar prefer to sue 1 rich person (Apple) - with a chance of getting big bucks — than 1 million and 1 poor people — (Johnny no bucks and his users). But I’m pretty sure Apple would be able to put together a license model that makes them safe in this case, long before they were put in any legal danger.
Anyone who claims it’s an intractable is using it for a different purpose -/ either trying to keep their sweet monopoly - or wishing they could sue apple.