Because these sites often operate on the edge of copyright laws, they are frequently taken down. If you bookmark Movir4u today, don't be surprised if it redirects to a different domain tomorrow, or vanishes entirely. It is an unstable way to watch your favorite shows.
Sites like Movir4u have to make money somehow. Since they aren't charging you, they monetize through aggressive advertising. We aren't talking about harmless banner ads. We are talking about pop-ups that redirect you, fake "Download" buttons that install software you didn't ask for, and sometimes, malicious scripts that can harm your device. movir4u