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That's because they actually get paid for providing a reliable service, not for ipv6.

Access to only half the internet isn't exactly a reliable service. None of china, none of africa, only half of europe, none of south america....

Those are regions that have a lot of v6 support alongside v4, not v6-only.

Most v4 support is through a gateway. You can't tell the user's IP address from the wrong side of the gateway, for example - only the gateway's address. The user isn't on v4, the gateway is.

Yeah, so you still reach the user, it's just probably less efficient than the all-v6 route.

Edit: Oh, you mean if they want unsolicited inbound traffic? Sure, but that's only a thing for services. I mean you can have a default-allow firewall to home devices but really shouldn't.

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