The survival choice of antivirus software: Free or Paid?

As we all know, "free" is undoubtedly a quite attractive signboard. There are many free things on the Internet, such as free email, free space, free forum, and free software, etc., which are countless. Of course, some people suspect that free equals poor quality, and we can understand this kind of thought. After all, the view that "cheap goods are not good, and good goods are not cheap" is deeply rooted in the minds of the vast majority of Chinese people. As the antivirus software product, which is the "door god" of computers, its quality worries many people. Can its free products be used? Dare to use it?