China is seeking to crack down on "unfair" competition among food delivery platforms by introducing new rules to limit subsidy campaigns that regulators say harm the economy.

Regulators target predatory pricing and merchant coercion, with new rules requiring that tech giants disclose subsidy data and not disrupt the market.

Under the new rules, platforms may not "indirectly coerce" merchants into participating in subsidy schemes through allocation of user traffic, and must not force merchants and…