The fine - Ofcom's largest levied under the Online Safety Act (OSA) so far - comes after it began probing the firm "within days" of age check rules taking effect in July 2025. 8579 LLC has also been fined a further £50,000 for not responding to Ofcom's information requests. According to Ofcom, the company failed to implement highly effective age checks on most of its porn sites between 25 July and at least 19 November 2025. The regulator says 8579 LLC must implement robust methods to check UK visitors are over 18 on one remaining site before 17:00 GMT on Monday, or face an additional £1,000 daily penalty.