The decision follows the introduction of the Online Safety Act in July, which mandates strong age verification for pornography sites to prevent children from accessing harmful material.
Aylo criticised the Act, stating it has made the internet more dangerous for both minors and adults and jeopardises the privacy and personal data of UK citizens.
Existing age-verified UK users will retain access to Pornhub, but new registrations will be blocked.
Ofcom stated that porn services have a choice between implementing age checks or blocking access, and they will continue to enforce the rules, noting widespread adoption among other sites.