Phones nowadays have cameras that are so perfect in quality, yet security cameras are mostly always so grainy so why? You can get a phone with a perfect extremely high quality camera for a few hundred these days, sometimes even less
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The technical limit is storage, high quality video eats it up fast. Of course, a system could be more clever about it, only keep video where something moves, extract and store faces, license plates etc objects of interests and store only those in high quality leaving rest in lower quality.
But you know, most prefer to have a cheap system rather than a clever system. You only really need a security camera to decrease insurance costs or to comply with some other business requirement. Ticking that box for minimum price possible is what most businesses choose to do. For most places, there is no business benefit to paying for a better system.
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