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Are they charging for use of external IPv6 addresses? I couldn’t see any differentiation between IP versions on the pricing page.

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I think Google actually should gives customers a discount if they go IPv6-only.

Assuming they aren't charging for external IPv6 (I imagine they aren't), then there effectively is a discount for going v6-only - you just need to choose to disable external v4, and not enable v4 NAT. That'll save you a few $ per month per VM. (Public IPv4s are $0.004 per hour.)

It looks like there's currently no way to go literally v6-only, i.e. not even having a private v4 address on the VM. The instance metadata server as well as the default DNS and NTP servers are still v4-only.

Private addresses are free, so there's no cost to keeping them.

Simplicity, for one. One set of routing tables, firewall rules, etc.

And if you don't have any IPv4 then you know that you are not accidentally falling back to IPv4.

For single-VM it doesn't matter, because who would you talk to, but if you have a bigger cloud setup then it would be nice to remove IPv4.

So depends what you mean by "cost".

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