If BitTorrent is so great why isn’t it used more today for file transfers vs hosted storage? Also it is mostly used for piracy because authorities cannot shut down a decentralized system.
Because browsers (except only Opera, it's Norwegian) don't want to turn on built-in torrent downloader, only because they know they'd got troubles from RIAA folks. There are some websites that offer downloads through torrents, like linux distros.
Blizzard has been using it for years: https://wowpedia.fandom.com/wiki/Blizzard_Downloader
This company is new and is using it as a CDN: https://www.peer5.com/
Bittorrent is everywhere, just like Linux, and you mostly don't notice it.