From my experience, Docplayer is good at SEO but nothing else. They appear to have crawled the web for all sorts of documents, which they mirror. Usually when I end up on docplayer it's because I've looked for some obscure document which has disappeared from its original location (or is no longer indexed there) but is still mirrored by Docplayer.
So, it would be nice to make a random sample of maybe 500 or 1000 documents and see whether they're available elsewhere (and already archived by wayback machine in more friendly formats). Nemo 20:27, 10 November 2019 (UTC)