Is it illegal to promote app to make money?

Legal analysis: what is prohibited by laws and regulations is legal, and it is forbidden to issue high-interest online loans.

Legal basis: Provisions of the Supreme People's Court on Several Issues Concerning the Application of Laws in the Trial of Private Lending Cases Article 28 If there is an agreement between the borrower and the lender on the overdue interest rate, such agreement shall prevail, but it shall not exceed four times the quoted interest rate of the one-year loan market at the time when the contract is established.

If there is no agreement or unclear agreement on the overdue interest rate, the people's court may handle it according to different circumstances:

(a) the people's court shall support the lender's claim that the borrower shall bear the liability for breach of contract for overdue repayment with reference to the interest calculated according to the quoted interest rate standard of the one-year loan market at that time;

(2) If the interest rate during the loan period is agreed, but the overdue interest rate is not agreed, and the lender claims that the borrower will pay the interest during the occupation period according to the interest rate during the loan period from the date of overdue repayment, the people's court shall support it.