If I say in Pinduoduo that it is faster to broadcast live on Aauto, will it be illegal for him to compare prices?

There is no violation.

Article 16 of the Regulations on the Administration of Internet Audio-visual Program Services stipulates that the audio-visual programs provided by Internet audio-visual program service units and accessed by network operation units shall comply with the provisions of laws, administrative regulations and departmental rules. Audio-visual programs that have been broadcast shall be kept for at least 60 days. Audio-visual programs shall not contain the following contents:

(1) Opposing the basic principles set by the Constitution; (2) endangering national unity, sovereignty and territorial integrity; (3) divulging state secrets, endangering state security or damaging state honor and interests; (4) Inciting national hatred and discrimination, undermining national unity and infringing on national customs and habits; (5) propagating cults and superstitions;

(6) Disrupting social order and undermining social stability; (7) luring minors to commit crimes and exaggerating violence, pornography, gambling and terrorist activities; (8) Insulting or slandering others and infringing upon citizens' personal privacy and other legitimate rights and interests of others; (nine) endangering social morality and damaging the excellent cultural traditions of the nation; (ten) other contents prohibited by relevant laws, administrative regulations and state regulations.