Probably because you don't suffer from life threatening allergies.

In EU we have more than a single brand of epinephrine autoinjectors in the wild.

Probably. But it still seems like many people discuss it as if it was such a "normal and everyday" thing. There are many kinds of medicine that is taken by ~1% of the population, how could people know about all of them?

Or perhaps it also only got famous in the US due to this price rise.

No, they are ubiquitous as the epinephrine autoinjector is a required part of an extended medical aid kit.

Okay, and do ordinary people have/see extended medical aid kits? What is that by the way? A first-aid kit? Is it in cars, at home, at workplaces or where?

At workplaces sometimes, all doctor offices in schools, most GP offices, all hospitals.

(in EU)