Admin/Owner of ContentNation.net here. It's not a scraper, just an feature incomplete ActivityPub service. It only fetches data if someone uses the web viewer with a known profile name or AP id. If it can fetch "private" data, something is wrong on the server to provide it. It does not do HTML scraping. So just what ActivityPub was designed for. Robots are excluded by robots.txt and nofollow, but some just don't care. So that might be a reason why it seems scraped.