What is the ruling on investing in the website IQ Arabian by subscribing to the Islamic plan, which the site claims is compliant with Sharia?

It is impermissible to invest in this website or other similar websites due to the condition of a profit percentage from the capital (15-17%). This is not permissible, as profit cannot be a percentage of the capital; rather, it must be a known, definitive percentage of the company's total profit. The prohibition is further intensified by the presence of other concerns, such as: not knowing the nature of the website's activities, the guarantee of capital, profiting from referrals and inviting others, and the potential use of leverage, CFDs (contracts for difference), and derivatives. All of these are impediments to permissible investment. A Muslim is obligated to investigate the source of their earnings, for "The Holy Spirit has breathed into my soul that no soul shall die until it completes its term and exhausts its sustenance. So, fear Allah and be graceful in seeking sustenance. And let not the slowness of sustenance push any of you to seek it through disobedience to Allah, for verily, what is with Allah can only be attained through obedience to Him."