[anamax]

> Other objections are that the advertisers would be the ones paying Wikipedia, and thus have the ultimate control; they can threaten to reduce advertising revenue in order to get objectionable material removed, they would incentivize people to put more advertising-friendly content that would draw people to lucrative pages and entice them to click on ads.

The same is true of contributors as is the response - get different contributors/advertisers.

> They are beholden to their advertisers, not their users.

They lose advertisers as soon as they lose users, so users control their advertising revenue.