Same issue with humans in a way. I disgree on the advisory nature of constraints, though. Unconnected physically limits would still matter, for example (and we use those with humans as a matter of course, too). In this case here, no model could have plugged in an ethernet cable if that would have been needed for internet access, for example.

Right, airgapping goes a long way. But this is where the tension with utility comes in. It takes a lot of discipline not to hook your very smart model up to the internet and code interpreters and all sorts of other tools, as this greatly increases its usefulness. It's very hard to keep people from turning on --dangerously-skip-permissions, let alone get them to run everything in a sandboxed VM.