There are official ad blockers for Safari on the App Store. Firefox and Firefox Focus on iOS have (ad-based) tracking blockers, and Microsoft Edge on iOS also has an ad blocker.
You’re talking about “strict tracking protection” that’s basically like browsing the web in incognito mode? That’s not really like Adblock origin. You know they only allow their own browser engine (WebKit) on iOS?
Apple has a set of APIs to allow third parties to write content (=ad/tracker) blocker extensions for Safari on iOS and distribute them on the App Store