I run a small ISP and have been building isolated Linux sandboxes (Firecracker microVMs) mainly for AI agents. Each one can get its own public IPv6 address, or run IPv6-only, which turned out handy for testing apps and services over IPv6 when your own network doesn't have it. If anyone needs something like that, feel free to try it at sandbox.wbx.cz, and I'm happy to hear what's missing or broken.