You mean decentralized, right? It only affects people who trust Russian ISPs. There isn’t a magical technical fix for what a sovereign authority can do within its jurisdiction.

It affects users of their DNS servers, which isn't the same as people who trust them.

And it's because of the centralized structure of DNS technology that it's possible for Russian sovereign orders to propagate DNS information to those users.

Just like the political science benevolent dictator replaced in a coup, retaining the previously-built chain of command.