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I don’t believe there was any specific API in use here, for virus scanning or not. I suppose maybe the device driver API? I am not a kernel developer so I don’t know if that’s the right term for it.
Crowdstrike’s driver was loaded at boot and caused a null pointer dereference error, inside the kernel. In userspace, when this happens, the kernel is there to catch it so only the application that caused it crashes. In kernelspace, you get a BSOD because there’s really nothing else to do.
The point of use flags is to make it so if you don’t want to print, every package that would otherwise pull in CUPS as a dependency can be compiled without it. Stuff like that.
Gentoo also has a good system for handling multiple concurrent installs of different versions of some packages, e.g python.
If there’s software you want to install from source that uses automake it’s pretty simple to build your own package for it.
Very much a system for doing things your way, and a good way to learn linux IMO. To that end, no there is no installer, but the process is not that complex. Boot a live USB, partition and format a drive, download and extract a base system, install a kernel (there is a fits-most-needs one available now), install a bootloader. Reboot into your new system and continue installing what you need from there.