Isn't DMCA unconstitutional as is? It restricts free speech rights.
But my question was not about it being directly unconstitutional (which I think it is). It was about it being nonsensical in the light of fair use (as the other commenter brought above about forbidding to look to the right before making a turn).
You just said that DMCA is separate from copyright and thus fair use doesn't apply to it conceptually. So DMCA is not related to right to establish exclusive rights to works and etc. And it restricts the free speech. So why is it not unconstitutional? (See https://www.techdirt.com/articles/20100402/1856128861.shtml