I was under the impression that the whole point of such a system was you could trust any video from any (non-cracked) camera. If we're at the point of trusting

I was under the impression that the whole point of such a system was you could trust any video from any (non-cracked) camera. If we're at the point of trusting videos only from select providers, well, that's not really much of an improvement over just finding the video on that provider's website over HTTPS.