We're basically at a point where running those older machines is more expensive, once you factor in power use. Even then, people using ancient fifth-hand machi

We're basically at a point where running those older machines is more expensive, once you factor in power use. Even then, people using ancient fifth-hand machines are almost certainly still going to run x86 - which means they'll have no trouble running Rust as 32-bit x86 is a supported target. Their bigger issue is going to be plain old C apps dropping 32-bit support! "Retro" in this case genuinely means "horribly outdated". We're talking about systems with CPUs in the hundreds of MHz with probably fewer than a gigabyte in memory. You might do some basic word processing using Windows 95, but running anything even remotely resembling a modern OS is completely impossible. And considering their age and rarity, I'd be very impressed if anyone in a poor country managed to get their hands on it.