[punee]

Where is that service if it's so valuable?

[aninhumer]

It exists (e.g. Which? in the UK), it's just undervalued because advertising already provides a low quality but free source of information.

[punee]

That doesn't seem very logical.

First, I think you mean "less valued". That's generally what happens when there's little demand for something, or when there's a good substitute at a cheaper price.

Second, if all the free, evil ad-sponsored content on the internet is of such "low quality", it certainly would make such services more valuable, as it would offer something scarce. Their conspicuous absence seems to indicate something is amiss with this analysis.