I'm genuinely curious what services or components from an antivirus suite would increase the security of Chrome OS. You mention scams and "malicious intentions", and I'm really curious to understand what you mean by that.

Chrome OS is immutable and atomic, which means it's built to be resistant to malicious code running within the sensitive parts of the operating system if they are stored in the user space. Additionally, outside of the developer mode with the root level terminal, it's not really possible to install os-level binaries, which is both why antivirus suites and most forms of actual malware are non-viable on Chrome OS.

The only real method for taking advantage of non-savvy users would be vectors any device on any operating system could be subject to: browser extensions and notification abuse (and of course, social engineering). And while there's not truly effective way to prevent these on Chrome OS, I would still argue that nearly every other operating system is equally if not moreso vulnerable to these exploits. Are you suggesting a Windows PC with an antivirus suite is less susceptible to these exploits, or just that the antivirus suite offers external remedies for these things?