Notice: While I have no direct experience, I have been advised StageVU is a pirated movie site.
FWIW, most if not all, are not real good quality, so that may be why they are not shut down. This is not a defense or endorsement, but a personal observation.
I would appreciate any links to other gratis-oriented sites or links to previous DC threads. Registration is Ok as long as it is legitimate and isn't just harvesting email addresses.
I have used www.stagevu.com
as a resource for locating movies. I have discovered some real flops there, but also some real gems too!