The big catch is that to file a proper counter-notification you have to reveal your name, address and phone number to the claimant (whereas the claimant is only

The big catch is that to file a proper counter-notification you have to reveal your name, address and phone number to the claimant (whereas the claimant is only required to provide "reasonably sufficient" contact information). This is ostensibly to allow for service of process if they decide to sue you, but it's also been abused to harass and intimidate people in various ways. Also, there's allegedly a loophole where the claimant can notify the provider's DMCA agent they're suing you, at which point the provider is obligated to keep the claimed material inaccessible, but then not actually sue you. I'm not sure this has actually been done, though.