According to Bloomberg sources, they apparently expressed concerns about the megadeal to the FTC, which is suing Microsoft to block the purchase:

Google and Nvidia provided information that backs a key FTC contention — that Microsoft could gain an unfair advantage in the market for cloud, subscription and mobile gaming — according to the people, who asked not to be identified because the process is confidential. In its remarks to the FTC, Nvidia stressed the need for equal and open access to game titles but didn’t directly oppose the acquisition, according to one of the people.