For countries, if you meaning connecting to VPS, lot of countries have good IPv6 connectivity now.
For me both ISPs I use have native v6. This will differ from person to person.
Responsibility and controls. If the host/dc assigns a dedicated addresses the contract can be essentially "the customer assumes all liability behind traffic". With NAT/LB you need at the very least quite robust, evidence-grade monitoring mechanisms tagging all traffic and keeping historical data. In practice, some for of active abuse prevention is required, otherwise huge chunk of your address space is going to effectively linger in blacklist limbo.
That is, if being unreachable below "presentation layer" is acceptable in the first place, but I guess the question kind of presupposes this.
Vultr has one that's $2.5/month v6 only. Probably good if you just need something tiny to run some automation.
What are the issues faced by v6-only hosts and are there countries where it is a non-issue?
GitHub is the main problem currently. Some software like composer does not work due to this.
https://github.com/orgs/community/discussions/10539
For countries, if you meaning connecting to VPS, lot of countries have good IPv6 connectivity now. For me both ISPs I use have native v6. This will differ from person to person.
https://www.aelius.com/njh/google-ipv6/
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or just offer v4 HTTPS LB bundled. Never understood why more places didn't do this.
Responsibility and controls. If the host/dc assigns a dedicated addresses the contract can be essentially "the customer assumes all liability behind traffic". With NAT/LB you need at the very least quite robust, evidence-grade monitoring mechanisms tagging all traffic and keeping historical data. In practice, some for of active abuse prevention is required, otherwise huge chunk of your address space is going to effectively linger in blacklist limbo.
That is, if being unreachable below "presentation layer" is acceptable in the first place, but I guess the question kind of presupposes this.