FYI, no warrant is needed to set up a pen register on a person of interest. That's where LEOs request that the Post Office record the envelope metadata of all your correspondence.
ISTM that pen registers not requiring warrants is reasonable -- I'm not sure it's good for society, but it is reasonable.
ISTM that keeping track of cleartext metadata emitted by personal devices on the public Internet is exactly like a pen register.
DNS w/ QName minimization, DoH/DoE, and preferably DNSCurve, are techniques that can reduce the visibility of various metadata involved in gathering browsing history.
ISTM that pen registers not requiring warrants is reasonable -- I'm not sure it's good for society, but it is reasonable.
ISTM that keeping track of cleartext metadata emitted by personal devices on the public Internet is exactly like a pen register.
DNS w/ QName minimization, DoH/DoE, and preferably DNSCurve, are techniques that can reduce the visibility of various metadata involved in gathering browsing history.