How does movieclipstrailers avoid copyright claim?

https://www.youtube.com/user/movieclipsTRAILERS

These guys just upload tons of trailers

How do they avoid copyright claims?

Or do they just let people claim copyright and then the copyright owner choose to just share revenue?

Partnerships. And generally speaking, People don't go after trailers since they are supposed to be for public veiwing. the more people that watch the trailer directly leads to more movie tickets being sold.