Plenty of Fish is one of the most popular dating websites in the world. Despite the fact that it’s visually unappealing, there’s good reason for its popularity. Unlike most of its competitors, Plenty of Fish is totally free.
Its operator, Markus Frind, reportedly makes $10m a year from advertising displayed on Plenty of Fish. On average, it’s said that he puts in about 10 hours a week running the site.