The owner of OnlyFans, a site known for its adult content that is credited with revolutionizing the online porn industry, has died at the age of 43.

Leonid Radvinsky, who was born in Ukraine and grew up in Chicago, had purchased the company in 2018 from its two UK-based founders, OnlyFans said.

The site's popularity surged during the Covid-19 pandemic, landing him on Forbes' annual list of billionaires just three years later.

He passed away peacefully after a long battle with cancer, OnlyFans confirmed in a statement, which asked for privacy for his family.

Founded in 2016, OnlyFans is a social media platform where creators can post videos and photos and charge subscribers for tips or a monthly fee.

Creators share a range of content from cooking to fitness videos, but it is best known for pornographic material and the way it encourages creators and fans to connect through livestreams, personalized messages, and direct requests for custom-made photos and videos.

In return for hosting the material, OnlyFans takes a 20% share of all payments.

The company generated $1.4bn (£1.04bn) in revenue from more than £7bn transactions and had more than 377 million subscribers in 2024.

About 4.6 million creators were posting to the site that year, it said.

The boom in size and popularity under Radvinsky's ownership also brought scrutiny from lawmakers and regulators over its adult content.

In 2024, British regulators launched an investigation into whether children were accessing porn, an issue that the company blamed on a technical issue. Ofcom ultimately dropped that probe, but it fined the firm about £1m.

Radvinsky graduated with an economics degree from Northwestern University and most recently lived in Florida.

He had been exploring a sale of OnlyFans last year, and alongside his ownership of OnlyFans, he invested in tech companies via a Florida-based venture capital firm, Leo.com.

His philanthropic efforts included donations to the Memorial Sloan Kettering Cancer Center.

Radvinsky leaves behind a complex legacy as he transformed the adult entertainment industry amidst significant challenges.