Why is renting referrals in NeoBux considered impermissible, even though it is based on mutual benefit, does not involve forbidden advertisements, and the site rents active referrals, and it can be organized to ensure profit, similar to the risks of other commercial projects?

The problem with referral systems and their rental differs from conventional trade, as it involves an exchange of money for money with disparity and delay, in addition to gharar (definition) (uncertainty) and jahl (ignorance) concerning the profit. This falls under the reality of gambling (maysir (definition) and qimar), unlike directly benefiting from the work of registered users without paying a subscription or fee.