Because there's no gopher client for macOS.
I bet if Google indexed Gopher sites at the outset, Gopher would still be a thing.
They have very little use. There's also a web proxy:
http://gopher.floodgap.com/gopher/gw
Browsing it makes clear why Gopher would not still be a thing, except in the same sense that there are hobbyists who maintain Model Ts and steam engines and whatnot. For a time, Gopher was a miracle and a wonder. That time lasted about a year. The web does all it does and infinitely more.
Gopher pretty much died long before Google was a thing. Here's a good article: https://www.minnpost.com/business/2016/08/rise-and-fall-goph... (lots of interesting comments below the article from many of the people involved)
There is a vibrant international community of people still on gopher, and a lot of us run our own servers. Check out gopher://gopherproject.org
There you'll find a getting started file, and other useful things such as a curated site listing (think DMOZ for gopher) called the Gopher Lawn.
For all the people lamenting the loss of the old internet, most of it is still there(irc,ftp,rss,ncurses email clients) -- you can still use it. You should probably ask yourself why you aren't.