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Apple limits third-party browser engine work to EU devices
(www.theregister.com)
This is a most excellent place for technology news and articles.
If you use the app then you have to pay for their subscription to use DNS features. If you don’t pay then you’re really just limited to adblocking in Safari. The profile I linked is free and will work for all apps. It’s not as robust or customizable as the AdGuard app, sure, but I’ve never had any real issues or need for anything more. Plus it’s one less app to have installed.
It’s personal preference mostly.