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It's not a VPN. Unless you mean "it's a VPN for your DNS traffic only". Which is an odd distinction.

It's implemented on iOS as a VPN, of which you can only have one active at a time.

Some Ad Blockers are implemented as VPNs. This is unfortunate, and they should use the Safari Content Blockers interface instead. Content Blockers cannot intercept or sell your content, since the code is sandboxed and doesn't get network access. NeverAds seems to work well for me.

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