Block lists will always be used for one reason or another, in this case these are verified malicious sites, there is no subjective analysis element in the equation that could be misconstrued as censorship. But even if there was, censorship implies a right to speech, in this case Google has the right to restrict the speech of it's users if it so wishes, matter of fact, through extensions there are many that do censor their users using Chrome.

I know for a fact that GSB contains non-malicious sites in its dataset.