It sounds like a mastermind plan, but in reality it's a consequence of a global intelligence working together on the same project over xx years.
It was certainly not designed with that much hindsight, otherwise we would never have had the infamous BGP-spoofing attacks (which were basic and easy at the time), the ARP-spoofing, not enough IPv4, etc.
Internet has iteratively evolved to be reliable, as each iteration has improved on top of the previous one. And this is not due to geniuses, this is due to
sys/netadmins who want to sleep at night more, so they are forced to choose and operate reliable techs.
It's a great way to sell it and it worked. Fortunately, the product (the internet) works even better that the slogan used to sell it. One derivative claim, "the internet treats censorship and routes around it" is not used much these days, but I do remember it actually being close to reality, for a brief moment in time.
It was certainly not designed with that much hindsight, otherwise we would never have had the infamous BGP-spoofing attacks (which were basic and easy at the time), the ARP-spoofing, not enough IPv4, etc.
Internet has iteratively evolved to be reliable, as each iteration has improved on top of the previous one. And this is not due to geniuses, this is due to sys/netadmins who want to sleep at night more, so they are forced to choose and operate reliable techs.