Take a look at the grammatical mistakes in English. No sales, no killing. If it is wrong, how can there be no killing without buying and selling?

Kill is a verb and can't be used after no, followed by nouns and gerunds. You can change this sentence to-no. Buying and selling, not killing people. In fact, you can also say no marketing or killing according to your meaning. But because the word "kill" means "kill", whether it is used here or in a shopping mall, the atmosphere is too sinister and murderous. Your original words had better be said as no marketing, no harm. There is no harm without marketing, which is more euphemistic and reasonable. Because of the market economy, it is inevitable that there are misunderstandings and conflicts of interest between businesses, and one party hurts the other from time to time, especially the consumer side is more vulnerable.

The above is for reference only!