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It’s a pretty safe bet that every frontier lab has multiple foreign intelligence agencies running assets inside of it.
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Every hyperscaler hosting these models outside of FEDRAMP environments has been compromised by every regional power’s intelligence services. Fable was running all over the world until today.

AWS and friends are very good at providing excellent enterprise grade security, but it’s literal child’s play for nation state threat actors to exfil these models.

TEMPEST / EMSEC alone is a wide open door for unclassified datacenters when the Mossad’s out to get you.

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I'm skeptical that you're going to be able to reliably exfiltrate ~10TB of model weights using TEMPEST. Which is not to say weights are secure, just that this isn't the threat model I would be concerned about.
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That would depend on what gets leaked, as I'm not so sure that the weights by themselves would be enough to replicate the architecture. I imagine some part of the secret sauce will remain in the architecture, and the tensor dimensions may not be enough to decode it.

I'm sure if proprietary models continue to be a big thing, the methodology of their storage and loading on hardware will be obfuscated quite a bit.

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But you can see this is not true (yet); competitors/Chinese labs are less than 6 months behind: either via leaks or by just stumbling on the same improvements with time/effort.
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What chinese labs are on par with GPT-5.3 and Sonnet 4.6 that I can go and use today? (granted they're 4 months ago, not 6 but nothing was released in Dec/Jan so I rounded up).
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Hope it happens someday. That'd probably be the best possible outcome for all of humanity.
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The gamers would really be complaining about why they can’t run Fable.torrent on their gaming PCs
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I don't think it's a good idea to give the crowds that kind of weapon. The first thing they'd do is "liberate" the model aka remove guardrails and safetly-protocols and brag on X / reddit with it and throw it into the public. That's only cool for a geek that doesn't think about the ethical impact of such a move. You'd basically become responsible for anything that is done with it, forever - have a good sleep. /s
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As opposed to what, the US military, or better yet Israel (because we all know they won't be excluded) using that model to drive weaponry that kills people?

Your hypothetical implies that there is a better alternative, but when those models are "restricted", in practice that means that the only people who have access to them are precisely those who can and will use them for the worst kind of shit. So yes, releasing them to the public is a better deal, ethically speaking, at least then the playing field will be slightly more equal.

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There are plenty of weapons (see custom made virus) which no state actor (or even an informal militia) would want to release, as these weapons attack everyone. But, open access to details of its construction leaves everyone vulnerable to motivations of small groups of crazy individuals.
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What if I told you there are no safety guardrails. I used GLM 5.1 and had fable literally build a harness to avoid triggering guard rails. I built skills carefully and had Fable doing vuln research and exploit repro in a few hours. I called the project manhattan. The GLM models are down for almost anything so I named it Oppenheimer. It orchestrated the fable CLI agents via tmux. This whole Fable/Mythos thing is such a fucking joke. It is all PR and theatre and they know it.
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I’ve been doing pentesting with LLMs for a while and only hit a few “nope I won’t do that” and one “this conversation is flagged for being against the TOS”. No idea what the guardrails are but they are trivially abused
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