We've changed the title above to the relevant phrase from the article, which mentions both Google and Apple.

(Submitted title was 'Amazon follows Google and bans system-wide ad blockers on their AppStore'.)

That’s not about adblocking but about using vpns for a purpose that is not a virtual private network. The general adblock system works in Safari as well as other apps that use web views though.

If we're talking about non-VPN solutions, then Android continues to allow several ad-blocking solutions such as browsers with it built in, or browsers like Firefox which run extension systems which support popular blockers like Ublock Origin.

Does iOS support custom browsers like Firefox running their own engine and extension systems? They never did when I was a user.

> as well as other apps that use web views though

Actually, they only work in the specific case of SFSafariViewController. This isn't available for any old webview to implement.

I was under the impression that Firefox Focus blocked ads in some other apps as well but that doesn’t appear to be the case indeed, at least not in Chrome.

Firefox Focus ships with a content blocker extension, I think, so it can block ads in Safari and third-party apps using SFSafariViewController. Chrome uses a webview, so the content blocker won't work there.

Firefox for Android supports uBlock Origin, which is the most efficient ad blocker for the web.

Safari's ad blocking is piss poor compared to it, because it is technologically limited.