Is it illegal to sell easily accessible software, Zhihu?

Not illegal. It is not illegal to sell easy-to-buy software itself, but it may be illegal to use software to maliciously grab and invade others' privacy. In addition, if there are problems such as infringement of intellectual property rights, it may be considered illegal to sell e-commerce software. Easy-to-use is a web crawler software, which can help users quickly collect data and information on the Internet.