Since I'm in a rush, I'll reply this: this is as "groundless" as your claiming it's "just a violation of Chinese laws (not censoring content)", or the Chinese government claiming the same. Since Google hasn't denied any of these reports, nor would it want to come out openly accusing the government of this (risking its operations), it won't give you your "hard evidence" to build a "well grounded report". However sources, analysts, and researchers who are deep into the field and who want to remain anonymous served as sources for these media reports, which come from reputed media houses. Hence I'm inclined to believe Google isn't stupid enough to leave China just because it's not willing to censor. It also tells you that something is a lot more fishy than just a case of not obeying the law. Google is a leading internet firm that operates in the majority of the connected world. When something like this happens you're inclined to take Google at face value.