I totally get what you mean, it can be a bit of a minefield out there with all the sketchy sites claiming to offer movies. One platform I've found pretty reliable is Kanopy. It's partnered with libraries and universities, so you can access a wide range of movies for free with your library card. They have a good selection, especially if you're into independent or classic films.

Another option you might want to check out is Tubi. It's ad-supported, so you'll have to sit through some commercials, but they have a decent selection of movies and TV shows, and it's all legit.