That is true. If someone is running Snow Leopard, they are out of luck. lolAssuming your on a supported version of macOS....
That's all I've ever used. A Apple tech installed it on my machine years ago when I called with some kind of problem. So long ago I don't remember why. It still works great!!MalwareBytes is "all you need":
Cyber Security Software and Anti-Malware | Malwarebytes
Protect your home and business PCs, Macs, iOS and Android devices from the latest cyber threats and malware, including ransomware.www.malwarebytes.com
IMPORTANT:
Select the "home" option.
It's a FREE download
IMPORTANT:
You DO NOT NEED TO BUY A SUBSCRIPTION to run MalwareBytes.
It will run FOREVER IN FREE MODE.
When you open it, IGNORE the button to "Upgrade Now" or "Activate License".
Just click "Scan".
Again, you DO NOT have to buy the pay-for version!