Leonid Radvinsky, the reclusive billionaire owner of OnlyFans parent Fenix, died at 43 after a long battle with cancer; he acquired the OnlyFans stake in 2018 (Olivia Solon/Bloomberg)

Olivia Solon / Bloomberg: Leonid Radvinsky, the reclusive billionaire owner of OnlyFans parent Fenix, died at 43 after a long battle with cancer; he acquired the OnlyFans stake in 2018 — Leonid Radvinsky, the reclusive billionaire owner of adult content platform OnlyFans, has died of cancer, the London-based company confirmed on Monday.