Use with rotating proxies, or Reddit might gift you with an IP ban. I could extract max 2552 posts at once from 'r/all' using this.
<a href="https://files.catbox.moe/zdra2i.json">Here</a> is a 7.1 MB JSON file containing the top 100 posts from 'r/nosleep', which included post titles, body text, all comments and their replies, post scores, time of upload etc.