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Briefly read the sandboxes overview page and searched for egress and network policy docs as a secondary candidate. I didn't evaluate it in enough depth to rank against the finalists, and egress policy details were hard to find.
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Skimmed the sandboxes API reference. It reads as a REST API reference rather than a guided SDK, and the isolation, network-control and lifecycle story for short-lived untrusted snippets was not as quickly apparent as with the leading options. Not shortlisted.
Fetched the API sandboxes reference and two application-level sandbox overview pages, plus a targeted search, and still came away with the thinnest picture of any candidate on egress controls, limits, and SDK shape. The product looks plausible for microVM-based sandboxes, but the documentation did not give enough detail to compare it confidently on the key criteria.