So, while I agree with the sentiment that it sucks that this crawling eats the quota, the solution is not to simply bypass the quota.
I'm a bit confused. What computation does the GoogleBot cause to be performed that benefits the Google service user? (Not Googlebot related stuff like indexing).
EDIT: Thanks kyrra!
How does not charging for outgoing network traffic make computation free? You'd still be paying for everything else, eg the instances themselves, datastore storage, read/write datastore calls, using the logs API, which means mining bitcoins wouldn't be free.
If requests initiated by Googlebot were free to run, you could make a giant website full of garbage and use each free request to spend 50ms mining bitcoin.
Otherwise you'd have a team at every cloud provider trying to figure out how to manage bots.
That, and adding proper support for tuning the crawl rate.
The more you think about this, the more insanely complex it gets.
[edit] That being said, the issue would be the same if it was another hoster or another search engine. I guess the real solution would be to be able to limit the crawl rate, as the OP said.