I'd disagree though that it's "extreme". There are local chains in my area (Midwest - US) that offer a variety of hot cold brew drinks that are quite popular offerings. I was pleasantly surprised when I ran across this more than a year ago. But I still do run into a number of coffee shops where baristas fail to understand the difference between cold brew and an iced coffee. There's really no comparison when you're explicitly looking for cold brew. It's also often hard to find available in the winter months in my region. Not sure why, but to me that's akin to pausing ice cream sales because there's snow on the ground. Just because it's a cold drink doesn't mean I don't drink it during cold weather.
The main problem is that I love the flavor of coffee, and I feel especially jealous on a Saturday morning when I can smell it but can’t drink it. Secondary problem is adjusting to a consistent caffeine level without getting headaches.
Wouldn't try to randomly talk a barista into making one, but if you see them on the menu at a shop or have an espresso machine, they're pretty neat.
Video on them: https://www.youtube.com/watch?v=tD_4hOg_SWU
I know a lot of coffee nerds and cold brew is disdained for not extracting enough flavors. This is just someone who never adapted to the world hoping the world will adapt to them.