My company was part of a partner acceleration program, however you can apply to be part of the Google Cloud for Startups program here[1], without needing to be in an accelerator.
Not OP, but when our startup was accepted into https://www.thefamily.co/ (which is basically a European YC), amongst other perks, we got a huge amount of AWS credits. I'm sure other incubators/accelerators do similar offers for GCE/AWS.
[1] https://cloud.google.com/developers/startups/