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Presumably the idea is to define 'commercial' as a website with ads or accept payments, rather than removing sites with ads to increase viewing pleasure.

I think it's a good idea. It'd certainly help with the problem of blogspam etc.

Also, it's not the ads themselves, but sites that produce content for the purpose of serving up more ads. May not be as good theoretically.

I think the idea was that the presence of ads indicates the advertisers had influence on content, which isn't true for a lot of websites which run ads.