Fair point. The V8 isolate provides memory isolation, and we enforce CPU limits (100ms) and memory caps (128MB). Workers run in separate isolates, not separate processes, so it's similar to Cloudflare's model. That said, for truly untrusted third-party code, I'd recommend running the whole thing in a container/VM as an extra layer. The sandboxing is more about resource isolation than security-grade multi-tenancy.