To understand why people still search for these torrents, you have to understand the "Codec War."

Investigation into the extent of infringing content on BitTorrent networks

The terms and Xvid represent a pivotal era in internet history, marking the first time high-quality movies could be compressed small enough to be shared on peer-to-peer networks. While these formats have largely been superseded by modern standards like H.264 (MP4) and H.265 (HEVC), they remain relevant for archival purposes and compatibility with legacy hardware. Understanding DivX and Xvid

For years, the battle between DivX and Xvid defined the standard definition (SD) era. When users searched for these terms in torrent lists, they were looking for the sweet spot: a file small enough to download in a few hours, but clear enough to watch on a standard television set.