No, it's not. The whole idea of centralized is... centralized. Not redundant. Redundant implies multiple nodes. That is the opposite of centralized.
Perhaps you are thinking peer-to-peer but that is but one form of decentralization.
to concentrate by placing power and authority in a center or central organization
Federal government is centralized in terms of financial consolidation, yet it has many nodes. For example, the 12 Federal Reserve Banks. Even though it's not physical in one place, it's still centralized because all money in the country eventually flows through one of its many nodes.
Decentralization is like pre-civil war era banking. Every state had its own currency and bank and there were exchange rates between each. No one had authority over it all until the Federal Reserve was created.
"Authority" is the key, not physical location.
Example: just because Amazon Web Services has clusters of servers all over the world, they are still centralized because Amazon controls them all. When you're talking to that service, you're only dealing with one entity (Amazon). What physical resource actually responds to the request is implementation details.
Again, not really. It actually makes more copies of it and in many ways is worse.
Yet, all transactions are anonymous because there's nothing tying an account to a human being. In order to trace an account back to a human, there has to be a study of the patterns as well subpoenas of merchants that interacted with the account. In centralized banking, there's so many anti-fraud measures in place that are completely non-existent in decentralized because of lack of authority to do so.
Not if there's another path that routers open, making the break temporary. TCP/IP depends on other techs but the point it it laid the foundation by making temporary blips in connectivity all but irrelelevant. It's all offtopic anyways, but I can state as a Cisco Certified Network Associate (for reasons I don't even fully understand, I never user that cert) I do know what I am talking about. Most issues in foreign countries where business would be transacted (markets) relate to cell connectivity and switching towers when one fails. That's firmly in the domain of TCP/IP.
Wow, guess CCNA certification these days are worthless. If layer 1, 2, and 3 aren't functioning, layer 4 doesn't exist. You can keep trying and trying and trying and all you'll get is timeouts. Cryptocurrencies are worthless without functioning internet infrastructure.