If you want to make sure you're not using a dodgy, potentially illegal streaming video site, there are a few indicators to look out for.
There is an “About Us” or “Contact Us” section. Legit streaming sites are run by people who are transparent about who they are and want user feedback. Lacking these sections could indicate that the owners of the site are trying to remain anonymous. They tell you where the movies are coming from. Legal streaming sites will disclose how they obtain the rights to host the content they offer. Generally this is done via partnerships with movie studios. They make money through advertisements. Free sites need cash to keep the lights on. Ads that interrupt viewing (similar to when you’re watching a longer YouTube video) are common. There’s an app. Android and iOS apps go through a review process before hitting the market to make sure they don’t violate any policies. Simply put, an illegal streaming app would never make it to the public. There are newer films available. If a streaming site is offering a film that is still in theaters or hasn’t hit home video yet, there’s a good chance it’s illegal. That being said, some newer films are being released to streaming soon after a theatrical release. In some cases they even start streaming on the same day. Our advice is to trust your gut. If something doesn't seem right, Google the film to see the official release dates for the both the cinema and home video.