Really sad indeed. Specially for a country with such a complicated situation as Italy.
Given that they are going to take you banner time, maybe they would be possible to be convinced to include a small "WLM ad" in the donation page? I would expect targetting people that visit the page but doesn't donate, or listing "other ways to help" after donation (a more standard one about editing could be used, too). It won't have the same impact as a banner, but it'd be an interesting approach.