I don't think anybody actually installs them on purpose. A lot of systems come with McAfee (Lenovo) or others pre-installed.

Interesting point, I've even has a Lenovo Legion and some ThinkBooks install McAfee autonomously after I installed Windows 11 Pro.

In enterprise environments it's a different story, McAfee and the like have similarly named products for the enterprise which actually do useful things for corporate security (like blocking unauthorized USB devices, blocking unauthorized software, reporting incidents to a central SOC system, etc.)