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Some sites already require registration so they can track payments... Unregistered users or registered users who have not paid, don't get full access.

Other sites abuse vulnerabilities and loopholes in implementation of scripting languages in browsers to circumvent ad blocking, for example constructing the code to show advertisements character by character, so regular expression pattern matching becomes too complex to implement.

As long as browsers don't restrict overriding and aliasing of internal functions of the drawing and/or debugging engine, there is always way to circumvent any restriction. Good example is how Facebook has constantly circumvented blocking advertisements.

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