There absolutely is NOT. Please see Jan's update ( and the others ) and confirm something like this before you accuse next time. I'm the plugin author of gplus-comments and to date its only code commit-er I can absolutely show that there is NO advertisements shown / loaded / or ANYTHING like that, there isn't even an optional attribution link of any kind let alone anything like that.
Please inspect the code ( its not that complex even for non-programmers to understand ) here in the official WP svn repo ( where the plugin is stored and deployed ) , please look at the complete history too , there never was at any time and then removed either.
I'll help you track what _is_ doing it if there is any way I can help, just let me know.