These websites survive on malicious advertising. Clicking a "Download" link often triggers automatic downloads of spyware, ransomware, or adware that can compromise your phone or computer.
Since Army of Thieves is a Netflix Original, your best legal option is to watch it directly on Netflix India. While Tamil audio is not currently available, you can enjoy the film with: Army Of Thieves Tamil Dubbed Kuttymovies Download
You can stream or download it directly via the official Netflix Website or the Netflix app. These websites survive on malicious advertising