1337x, like many free sites, relies on advertising. Some ads can be intrusive or lead to misleading pages. A robust ad-blocker will clean up the interface and prevent accidental clicks on malicious links.

(e.g., Southeast Asia or Eastern Europe) where these sites are most prevalent?

Streaming services are deleting content for tax write-offs. HBO Max removed dozens of animated shows and documentaries from existence. The only copies left are on hard drives of torrent users. In this context, the torrent network acts as a decentralized library of Alexandria.

: Massive files like AAA PC games are frequently distributed via torrents. FitGirl Repacks is highly popular for providing heavily compressed game files to speed up downloads.