I guess it is pretty much perjury penalty risk free to make such DMCA declaration from outside of US:

>Declaration: I have taken fair use into consideration. I have a good faith belief that the use of the copyrighted materials as described above is not authorized by the copyright owner, its agent, or the law. I swear, under penalty of perjury, that the information in the notification is accurate and that I am the copyright owner or am authorized to act on behalf of the owner of an exclusive right that is allegedly infringed.