Would you consider Candy Crush an ad? It was preinstalled. Was the pinball game that used to come with Windows an ad for Maxis Full Tilt Pinball? Was the U2 album that Apple gave away for free an ad for U2? (that was even worse since it was very difficult to remove the album from iTunes).
To be clear, I don't like that Microsoft bundled Candy Crush. I even saw it on my work PC running the enterprise version of Windows! I'm just not sure I'd consider it an ad.