[jacquesm]

Even small nation states have a hard time defending against the larger ones, it is as you correctly identify merely a matter of writing a larger check but the amount on that check is so much larger than what is feasible that even the largest nation states find themselves routinely hacked.

Security is hard. So hard that no matter what amount of money you spend you will still be vulnerable, but maybe a bit less so. There are no absolutes in this.