Use a gell cell lead acid battery (the kind that go in regular UPSs). No fire hazzard, ans bonus, they can survive freezing temperatures just fine if outdoors. Downside is replacing a cheap battery every 3 years.
Wouldnt productivity have two knobs? Efficiency and energy/effort input?
Also efficiency sometimes goes against “right”? If you need resiliancy you then “right” migh include redundancy. In software, that could also be guardrails like memory safety that necissarily take some extra abstraction to implement and a processing penalty?
Case in point: Alberta. As a landlocked province, they have been struggling to get oil and gas to markets, being limited by the pipelines other provinces or the US is willing to build. Now, the vast, vast majority of the planned ai datacentres in Canada are in Alberta, with insane sweetheart deals from government.
They found a way to get paid to burn gas within their borders and are going whole hog.
For a while, I thought their end-game was simply to get “too big to fail” before the bubble burst and get that bailout. But you are right - they either overshot or have some other idea in mind because now they are too big to bailout.
Security by obscurity is when the design or archetecture of the system is obscure enough to supposedly styme attackers (it doesnt), and as soon as people understand the design, your security is broken.
A hard to guess unpublished subdomain is a transparent and standard archetecture - nothing obscure about it and publishing that you use such a scheme doesnt break the security.
The subdomain is a bearer token that serves as an access control and just like a key or passphrase, has a security value proportional to the bits of information an attacker has to guess.
The real limitation is that browsers and humans are not great at not leaking domain names, so its very possible it will get leaked eventually and hard to rotate. Thats the reason they are weak. Still, they can be usefull to stop scanners just trolling for unpatched services.
It has been almost a trope that every time the discussion of them buying up the used market and cutting them up to scan, some apologist comes along and says that these books are mass produced garbage and not rare.