Mugshots end up online because arrest records are public, and automated...

https://wiki-velo.win/index.php/Why_Are_There_So_Many_Duplicate_Mugshot_Pages_for_the_Same_Arrest%3F

Mugshots end up online because arrest records are public, and automated scrapers constantly harvest this data for profit-driven websites. Once a photo is indexed, it spreads quickly across various platforms