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Apple has been working on blocking several popular VPN based ad-blockers, and have said that the apps wont get any further updates due to their non-compliance with the App Store policy.
Apple claims that these apps violate point 4.2.1 of the App Store Developer Guidelines, which states that "Apps should use APIs and frameworks for their intended purposes and indicate that integration in their app description”.
Apple has had these policies in place for quite some time, and the company has been quite lenient when it comes to enforcing them. This has led to a wide variety of blocking apps onto the Store and a boom in their popularity. Now that the company is clamping down on these apps, lot of popular apps like Adblock and Weblock will not be able to update, but the existing versions have not been removed as well.
The issue Apple has with these apps is their VPN based operation, which installs certificates on the device to block advertisements across iOS browsers, even third party apps like Chrome. The only blocking app permitted in iOS will be the ones that use the official Safari Content Blocker API, which would only work on Safari, Apple's native browser.
This does seem like another way for Apply to enforce the use of Safari. Competing browsers
As of now, iPhone and iPad users can continue using any affected ad-blocking apps in their current state, without getting any updates. This might result in them soon becoming incompatible with iOS and browsers, thus pushing users to use Safari more.