1. Risk control: Interest-free installment requires the platform to bear certain risks, because the platform needs to advance the commodity price in advance and bear the risk of installment repayment.

2. Business model: Pinduoduo's business model mainly realizes price advantage through group buying and group assembling to attract consumers at low prices.

3. Restrictions on partners: installment interest-free service requires cooperation with financial institutions or partners, and Pinduoduo may not have reached relevant cooperation agreements with these partners.