They buy them;
Just as Amazon (and other big ones) do.
Have you ever compared the prices of these VPS to IPv6-only VPS and wondered why IPv6-only ones are so much cheaper?
By definition there are only ~4 billion IPv4 addresses available. No matter how fair you distribute them; that is simply not sufficient for todays -let alone future- demand.
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The client can always select to use “server -4 *.pool.ntp.org” to get IPv4 only, or “server -6 *.pool.ntp.org” to get IPv6 only. There is no need to break the geographical structure by adding a special IPv6 subdomain.