Is the Bitcoin Core software managed by a central authority? Is the Bitcoin Core software managed by a central authority? It is in the context, that once a transaction is broadcast by a user, then is it centrally published at the application level (i.e Bitcoin Core) or it is propagated physically to every other user through the Bitcoin network?
It is propagated server-to-server and, with luck, eventually gets to a bunch of miners who will include it in a block. There is no central authority -- individual servers are free to propagate transactions using whatever rules they wish.