As long as others have the same option, what's the problem? The article specifically says "Google is not the only company." (at least the Google translated page does).
> Also, sponsoring Adblock is changing the market conditions
Sponsoring? Maybe you can parse the original article in the language it was written, but I cannot and the translated article doesn't seem accurate enough for me to make assertions as to exactly what Google is and isn't doing, or more specifically, what Adblock Plus is or isn't doing when Google, or possibly many others, give them money.
> To me, this is changing market conditions in the same way as my AT&T example
How is this different than Google taking out a full page add in the New York Times? In both cases Google is paying a third party which does not have complete control of the marker for some advantage (exposure in the NYT case). It's not as if they are paying for nobody else to be able to do as much (and even if they were, that's not a problem as long as a competitor could outbid them for the same right)