What is the ruling on money earned from a website that pays the subscriber for viewing advertisements, with an additional profit for inviting new subscribers, or when the subscriber opens multiple accounts for himself to earn more?

Earning money through passing on advertisement links is permissible, provided the advertisements are free from any prohibitions (pornographic images, alcohol, usurious banks, gambling, proselytizing websites), and that the work is not done through different accounts, as that is considered cheating and deception.