@Sunshine A tool I find way too rarely mentioned in that context is
https://constexpr.org/innoextract/ - it allows to unpack the Windows and Linux installers from GoG without actually running them.

That's for instance relevant if you are on an ARM computer and don't want to bother installing box64 just to get a DOS game running.

@cupcakezealot @vertelleus Didn't Vuze (aka Azureus) try to build a decentralized streaming service once? I could see how this might work, if built on top of Kademlia and WebSeeds.