What is the ruling on working for the company (hqrevshare.com) from which one buys advertising shares at a minimum price of $5, and then the company pays you profits amounting to 50% of the paid-in capital, with the return of the paid amount ($5 + $2.5) within a certain period (30-35 days), knowing that the company does not guarantee the advertising units, and the problem lies in determining the profit?

It is impermissible to participate in the aforementioned company's program, as long as it guarantees the participant a percentage of profit added to their capital; this is usury (riba). Furthermore, its field of work, advertising for commercial insurance companies and usurious institutions, is not permissible. Legitimate means of earning are many, and no soul shall die until it has received its full provision.