We could have perfectly controlled elections by contracting with a firm like PayPal, FedEx, Charles Schwab or StubHub that does millions of transactions every hour with almost flawless execution.
Those systems are centralized and use a third party clearing center taking a relatively long time to settle.
BCT is decentralized and fast, near instantaneous in settling. That makes a huge difference to security and data integrity.
Each of those organizations you listed and many others not listed could not adopt BCT for voting transactions because, by its nature, BCT exists outside any centralized organization.
BCT operates spontaneously in a changing nodal network. A would-be hacker can never know what node is next to be updated and often the message and the node are changed in random fashion. As the information spans out and updates, on its way to its final destination, the definition of the network can not be known in advance.
Think of it as a fighter pilot or computer reacting in real time to enemy attacks. Is the aircraft taken up, down, spiral out, twirl, etc.? All those decisions are left to chance, meaning spin a wheel and pick a number. If the transmission network was known in advance, it could never be secure. When the network is changing, the information packet has a chance to deposit itself at many nodes on the way to its destination and if any node is hacked, other nodes have the information and are polled.
BCT is much better suited to voting than a consumer commerce network. The consumer networks need to know all Point of Sale terminals, and from there the information follows a well-defined path to a centralized location.
There are many security issues with such networks. There are so many security issues, that the industry of e-commerce is forever playing catch up to the latest breach. To become more like BCT, the e-commerce networks would have to install and constantly change intermediate nodal points and they simply cannot do that. They might as well build their own internet. And even then, one of their IT people would know all of their nodes and be able to map out a hack strategy. It isn’t going to happen.
BCT operates on the principle that if there is one hack of a node in the network, there are many more nodes that are unknown to the hacked node and those nodes continue to operate with consensus, at a speed which a nodal hack attack can’t keep up with. Decentralization and nodal cover are key.