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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.
For adblocking, You can get Content blockers from the app store that you enable in the settings, Personally I use Adguard Pro. I've also got an Extension that makes websites Dark mode called 'Noir', You can adjust settings global/per site if they dont look good.
Extensions/Content blockers are limited to Safari (to my knowledge).
Cheers, I did not know this!