Sure, but using Wikipedia content in manner permitted by its license is not 'stealing' it.
Let me guess... Linux distributions are "stealing" Firefox? Oh, there isn't some holy war against that, so it's a good thing. Right.
It is perfectly compliant with GPL/GFDL to take the product and fill it with ads. There is nothing wrong with doing that.
The liberal licensing of Free software/content does not mean every use of those freedoms is a good and positive thing. And nobody is being inconsistent by treating it as a bad thing, while still recognizing it's within one's rights to do.