To be more clear, antivirus in general are mostly scams because they are advertised to do much more than they are actually capable (especially proprietary ones that act as spyware such as Norton or Avast, which have been caught selling user data). Hash based antivirus solutions (such as ClamAV) aren't effective either because they rely on "badness enumeration", in which you try to determine all the bad samples (through a sample list(s)) and alert or delete them when detected. This isn't a good solution because a threat actor only has to add for example a single whitespace character into the code and it will produce a wildly different hash (which has not been sampled before). Badness enumeration is shit way to deal with real problems, much better is an allowlist approach, such as a permission system where to minimize the access given and soften the security until the app runs.

TLDR: Antivirus bad at job of stopping malware, and sandboxed apps good for security of your device.