while a phone signing a video to show that it was captured with the camera is possible, it will be easy too to fake the signature. all it would take would be a hacked device to steal the private key. and even if apple/google/samsung have perfectly secure systems to sign the origin of the video, there would be ton of cheaper phones that would likely won't.
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no, it is not. you struggle to comprehend it because it is not true.
it is comparing different things. one is a valuation, the other is the value of goods and services over a year. the comparision would be with yearly revenue of a company