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Counter: subpoeana Pinterest for the IP address(es) used to access its site using that email address, then subpoena the ISPs.

If they want to waste that much money to learn that I only use public wifi, more power to them.

Exactly. I wonder how many threatening letters the average Starbucks location receives per month?

Tor would do it.

Also not copying images locally (so no uploads) would appear to remove any personal liability despite what Pinterest may wish to claim.