> To this day, Macs are practically virus-less
Exactly what I'm talking about. Not to this day, but to some time back in 2015. Right now any trojan toolchain on the black market comes with a Mac-targeted package.
Trojans always existed. But trojans aren't viruses, and if you don't get your stuff from shady websites you don't have much to worry about (and if you just get signed and sandboxed App Store stuff, even less or nothing to worry about).
What "zoo"?
To this day, Macs are practically virus-less, which they always where (99.999% of the scares in the media were for trojans, and even those at worse affected something like 1-5% of the total user base) -- nothing like the good ole Windows (XP and pre) days where after 1 day surfing the web you'd have a few viruses.
And of course if you go with the default options (gatekeeper, signed packages, etc) you have even less to worry about.
It's also not about "market share" -- Macs had 1/4 the market share they have now in 1990-1997, but there were tons of viruses for them under the old OS.
It's not like the original (pre-many security features were introduced) OS X was specially hardened or anything, but it was much more secure than Mac OS and the old Windows versions just by having a basic UNIX-style design.