That's pretty stupid. CS did have those fake ads for some sites (maybe they were real at one time?), which have literally become part of the background. I don't even see them. There are also ways of some servers putting their own ads in, floating in the air or on a wall or something. There are sometimes ads when you're loading the game too. I mean, if the ads stick to the general subtleness of the ones already in there, then I have no problem, because they're really unobtrusive. I hope they dont suck though.
And why 1.6 and not source?