Ah, I understand :)

The Internet could have worked very differently, with virtual circuits instead of raw datagrams. That's what the telco people wanted. See TP4.[1] Although there's a connectionless TP4 mode, one plan was that you'd only be connectionless within your own organization. If you wanted to talk to the larger world, you'd have to dial up a billed virtual circuit via your telecommunications provider.

Really cheap fiber backbones are make a pure datagram Internet work. We still can't handle congestion in the middle of the network. Congestion has to be forced out to the edges. There was a period in the late 1990s when MAE-EAST and MAE-WEST, the big peering points, routinely went into congestion collapse and only about 30% of packets got through

[1] https://en.wikipedia.org/wiki/Connectionless-mode_Network_Se...