That wouldn't do any good; these are network services, so they could always add attack code after the vetting, or perform a de-anonymization attack (trivial if

That wouldn't do any good; these are network services, so they could always add attack code after the vetting, or perform a de-anonymization attack (trivial if you're not using TOR, potentially jury-riggable (eg based on what files you use them on) even if you are) and send it only to targeted visitors.