Even Windows doesn't really even need a 3rd party anti-virus anymore. The built in windows defender has gotten so good as to really be all you need for active protection unless you're insanely stupid and keep bypassing it. Use Malwarebytes for deep file scans once in a blue moon, and you're golden.
Hate to tell you this, but Linux nor MacOS are safe without AV
It's just Windows, by far, has the largest share of active systems so everyone targets it. Both MacOS and Linux have their own share of bonafide viruses though