Piracy movie streaming websites rely on CDN servers to exist. This are servers where films are hosted and from where films are streamed. This is very big infrastructure investment (by far bigger than is required to run popular torrent tracker) which is not possible for random pirate enthusiast with web develolment skills. This means that most of those sites are run by pirate enterprises (it’s known fact that most of those CDNs are sponsored by illegal gambling operators that’s why many of pirate streaming cinema is spammed with casino advertising). So most of similiar looking streaming sites are whitelabels: this means they have same owners, common CDN, same backend and only differ with domains, frontend skins and also they could have a bit different films in database. Such sites are created to get most of free traffic from search engines (so if positions of one site would drop, other site from same owners could raise and compensate this drop).