Yep! Okular is amazing, and it’s available on Windows too. Install it for someone and they’ll never bother you again about PDFs or EPUB documents, it’s performant and everything works: printing, resizing, selecting text, searching, signing, adding comments. Never worry about paid PDF software or shady slow apps that keep trying to gatekeep features.
Sure. However, the posts in this community are not that at all, they’re childish and wrong at best, and slanderous and inflammatory at worse.