The military we have—an army built around tanks, a navy built around ships, and an air force built around planes, all of which are technologically advanced and astronomically expensive—is platform-centric. So far, in Ukraine, the signature land weapon hasn’t been a tank but an anti-tank missile: the Javelin. The signature air weapon hasn’t been an aircraft, but an anti-air missile: the Stinger. And as the sinking of the Moskva showed, the signature maritime weapon hasn’t been a ship but an anti-ship missile: the Neptune.
This goes for anything that wants to operate at scale. If you want billions of users to post millions of times per second, the transaction costs are going to have to be tiny. If the transaction costs are tiny, it becomes too easy to abuse. The bigger the scale of the thing you want to do, the harder this becomes.