[Underpass9041]

As someone receiving a notice you have no idea if it's legitimate or from a AOL account someone made 15 minutes ago, the threat of it being perjury doesn't work when there's no authentication whatsoever of who sent it. Unless the DMCA is signed by Zaphod Beeblebrox the receiver has no choice but to assume it's legitimate.

[SteveNuts]

What happens if you ignore it?

[gruez]

You lose safe harbor protections, which means if the notice was legitimate, you could be on the hook for copyright infringement as well.

[bombcar]

You can respond and refuse, but you have to authenticately dox yourself to do so, and you assume liabilities.

[more_corn]

Provider has to take it down. The vendor making the shirt can simply file a dmca counterclaim (basically stating that the dmca claim is invalid) Then the provider puts the content back up and the courts decide.