Reddit Keyword Filter runs only on reddit.com. It reads post titles, flair, text previews and author names (with Pro also comments) on those pages and compares them in the browser with the user's own lists; nothing it reads is stored or sent anywhere. The lists and options are stored locally in the browser. The only data that leaves the browser is the email address the user enters to buy or restore Pro: it is sent to Stripe (payment) and to the developer's license API (https://lakeside-ext-api.expo.app), which only answers whether a purchase exists. No analytics, no tracking. Full policy: https://lakesideapps.expo.app/extensions/privacy/