I worked at a large networking company a few decades ago. Our “sandbox” was far superior to anything I’ve seen at these companies. What are we even talking about here? Why do they even have open routing to the broad internet? With no monitoring/alerting? These just sound like token efforts at this stage.
I don't think their safety measures were the best, but "just sink the cluster to the bottom of the ocean so nothing can get out" isn't a training methodology that results in a model that people will want to use.