If you want something to be fast you need it stored locally. Storage used to be big and expensive, thus the cloud. And network used to be slow and expensive

If you want something to be fast you need it stored locally. Storage used to be big and expensive, thus the cloud. And network used to be slow and expensive too, so the uplink direction wasn’t very effective unless there was a company behind it. Which is to say - the main technical problems that hampered BitTorrent probably aren’t there anymore.