Why don't large companies use it for updates? I have a lot of trouble downloading the 10+ gigabyte IOS downloads on DSL for some reason but torrenting works fine for larger files and stopping and resuming does not break torrenting unlike Apple's update process.
Some have. Blizzard used a variant of BitTorrent about 10 - 15 years ago to distribute the multi-gigabyte patches for their online games. Peak demand was very high with hundreds of thousands of users all on the same day.
It was built into the game installer / launcher. I think they've switched away from that since. I remember it causing some consternation at the time given some people pay by the byte for network service and felt it was unfair.
I don't know if this would be of interest to you, but https://lancache.net/ is really fun to setup. I assigned an old (unreliable) 500gb SSD to a Linux VM and run Lancache on it. A couple tweaks to Pi Hole and every system in your house will use with no configuration (and fallback to Steam if it's down).
If you only have a single gaming system it won't matter but if you have a few it's fun to watch the second one get 100MB/s Steam downloads in a house with 20MB/s internet.
Even without the tax havens, the jurisdictional issues seem killer -- if I pay for software in Kansas and download blocks from Texas, California, Puerto Rico and Canada, who all do I owe sales tax to?
