I wonder... Is bundling adware installers with GPL software a violation of the GPL? (If not, should it be? v2?/v3?) Where's the installer's source? It wraps it in one linked executable file and presents itself as an installer for it, so I am not clear that any "mere aggregation" defence would hold?
There's also a reasonable argument that this brings the official project into disrepute: The GIMP may not be trademarked, but would it have to be?
Firefox, of course, is trademarked. I dearly hope they've never wrapped Firefox installers with adware, because Mozilla would not like that.