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I’d be curious how that compares to other cloud providers.

Almost all of them list their IP ranges. I went and ran the numbers on DO's, available from: http://digitalocean.com/geo/google.csv

2,344,576 IPs, so ~47mm on the same math.

And for Google's from: https://www.gstatic.com/ipranges/cloud.json

7,580,928

So ~151mm, on the same math.

When they shut down GCP in a couple of years, I wonder what they’ll do with all the addresses?

Hrmm it's not that much of an error since that is dominated by the /14 and /15 but there's a few /16 that Google uses for itself that aren't in that list. See the DNS TXT records for _netblocks{,2,3}.google.com

Yeah, I limited to GCP rather than trying to pull together everything Google owns for simplicity.

I've heard Google Cloud doesn't even mess with IPv6, which I find astonishing.

They're still expanding their IPv4 holdings, and IPv6 support would hamper that.

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