I kind of understand it for restaurant menus. Both "real" restaurant and takeway places need to print actual menus and/or flyers, and it's just easier to create

I kind of understand it for restaurant menus. Both "real" restaurant and takeway places need to print actual menus and/or flyers, and it's just easier to create a PDF document and upload it to your website than it is to reformat the document to be useful as web page in many cases if you are not well versed in this. Since PDF readers in browsers got decent, this isn't too much of an issue anymore anyway, IMHO.