Comment by ndriscoll

I think you misunderstand what I mean by "centralized". I mean e.g. at your gateway/firewall/router. As in a single place for you to enforce policy on your network.

At least in the US, what happens outside of your network is mostly irrelevant (except perhaps that free, open wifi should be liable for any lack of filtering). Centralized (as in e.g. government) control is non-existent, and centralized monitoring is easily defeated if you'd like with a variety of methods (though like I said we could have laws against the monitoring).