It's not even that. It's that "centralization is more efficient" is a big fat lie. If you look at the "centralized systems" they're... not actually technologically centralized, they're really just a monopolist that internally implements a distributed system.
How do you think Google or Cloudflare actually work? One big server in San Francisco that runs the whole world, or lots of servers distributed all over?
I know exactly how they work, but they have a single entry point, as a customer you don't really care that the system is global, and they also have a single control plane, etc. Decisions are efficient if they need to be taken only once. The underlying architecture is irrelevant for the end user.
Why do you think they're a monopoly in the first place? Obviously because they were more efficient than the competition and network effects took care of the rest. Having to make choices is a cost for the consumer - IOW consumers are lazy - so winners have staying power, too. It's a perfect storm for a winner-takes-all centralization since a good centralized service is the most efficient utility-wise ('I know I'm getting what I need') and decision-cost-wise ('I don't need to search for alternatives') for consumers until it switches to rent seeking, which is where the anti-monopoly laws should kick in.