Have those gangs been punished by law about the deceptive advertisement "Spend a lot of money on children"?

According to the actual situation, paying a large sum of money for a child is suspected of criminal fraud, or it may be a violation of public security management. Once found, it will be made to bear corresponding legal responsibilities according to law.

Relevant laws and regulations:

Criminal law of the people's Republic of China

Article 266 Whoever defrauds a large amount of public or private property shall be sentenced to fixed-term imprisonment of not more than three years, criminal detention or public surveillance, and shall also, or shall only, be fined; If the amount is huge or there are other serious circumstances, he shall be sentenced to fixed-term imprisonment of not less than three years but not more than ten years and shall also be fined; If the amount is especially huge or there are other especially serious circumstances, he shall be sentenced to fixed-term imprisonment of not less than 10 years or life imprisonment, and shall also be fined or confiscated. Where there are other provisions in this Law, such provisions shall prevail.

People's Republic of China (PRC) Public Security Administration Punishment Law

Article 49 Whoever steals, swindles, plunders, robs, extorts or intentionally damages public or private property shall be detained for not less than five days but not more than ten days, and may also be fined not more than 500 yuan; If the circumstances are serious, they shall be detained for not less than 10 days but not more than 15 days, and may also be fined not more than 1,000 yuan.