"redundancy" might not be there correct word. If we had a single worldwide mega-entity serving 100% of the internet it would be both a monopoly and would have tons of redundant infrastructure.

But it would also be quite unified; the system, while full of redundancies, as a whole is a unique one operated the same way end to end; by virtue of it being a single system handled in a uniform way, a single glitch could bring it all down. There is no diversity in the system's implementation, the monoculture itself makes it vulnerable.