> OSX and iOS have anti-malware tooling built in

You ever seen them notify users of detection and remediation? Yeah, didn't think so.

> Malwarebytes, Norton, McAfee etc. don’t accept liability for what their scans find

Because they're not liable as not the authors of the operating system. Apple's position is "Macs don't get malware" and any contrary fact is quickly swept under the rug.