One starts to wonder, at what point might it be actually feasible to do it the other way around, by whitelisting IP ranges. I could see this happening as a community effort, similar to adblocker list curation etc.
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Google indexes in country, as does a few other search engines..
Would recommend.
I looked at all the IP ranges delegated by APNIC, along with every local ISP that I could find, unioned this with
https://lite.ip2location.com/australia-ip-address-ranges
And so far i've not had any complaints. and I think that I have most of them.
At some time in the future, i'll start including https://github.com/ebrasha/cidr-ip-ranges-by-country