The impact of that declaration is that people today are talking about "open access" and moving to open-access publishing models, and new ACM articles are being published as CC-BY or CC-BY-NC-ND.

Most people don't have any idea what we're talking about; if you asked most people what Kosaraju's algorithm was, how an absorption refrigerator worked, or who the Four Hundred were in the Gilded Age, they also wouldn't have anything sensible to say. In https://link.springer.com/article/10.3758/s13428-012-0307-9 they found that less than half of college students in the USA knew the name of the capital of Iraq, which was currently full of US troops. And in https://youtu.be/ZjGd1F1Xk8w?t=18 you can see lots of random people who don't know what "WWW" stands for and think Asia is a country.

Talking about "open access" without knowing about the Berlin Declaration at the heart of that movement is the same kind of ignorance.