Because these sites have no privacy policy (SSL certificates are often fake or absent), any data you type (including search queries or emails) is sent in plain text, visible to hackers on public Wi-Fi.
If you click a link that looks like a "Download Movie" button, you might be redirected to a fake login page asking for your Google or Facebook credentials. This is a phishing attack designed to steal your social media or banking accounts.
Perhaps the most immediate danger of ssrmovie.org to the average internet user is cybersecurity. Because these sites operate outside the bounds of regulations like the Digital Millennium Copyright Act (DMCA) or General Data Protection Regulation (GDPR), there is no oversight regarding user safety.