This was true before missile defense systems started becoming a factor. If 1500 is an effective deterrent, you need 1500 multipled by the inverse of whatever percentage of those bombs your adversary can plausibly stop.
In the UK, "America" always refers to the USA. North America and South America together are called "The Americas", never "America". It may be different in continental languages.
They both had a direct competitor that had been stalking them for years before implosion, and neither were as well established or well funded as Meta/Facebook.