That was how government announcements were published for centuries. You ¿still? see that at police offices, with “Wanted” posters.

Sure, we also have bulletin boards, we just don't pin entire newspapers to them (anymore?).

This used to be very common in Italy, particularly near community centres, libraries, and political-party locations (in the latter case, of course, it was restricted to specific newspapers). It took a lot of maintenance (vandalism, weather, etc) and slowly disappeared with the multiplication of media channels. Still, it was a very low-tech/high-democracy way to disseminate information. You can still read newspapers for free in libraries and cafes, but obviously it’s not the same (you cannot discuss with others at a library, and cafes will typically stick to sports and local news to avoid alienating anyone).

This is sort of a thing in Portugal. They display all the papers on a board and you can (and people do) read the front pages, and then you can decide if you want to buy one to read the rest.

Yep, in Russia too, at least 20 years ago.