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I for one find clean slate tech approach adopted by Reliance Jio in India very inspiring. IPv6 support from start which saves it tons of money for buying IPv4 addresses , similar to their decision to adopt native 4G LTE Volte from start that helps it save tons of bandwidth on voice compared to Legacy 2G , 3G voice options.

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So they run v6, that's great, but they need to run 464XLAT (or something like that) too, and that probably isn't cheap either. (Though they'd probably pay a lot for v4 CGNAT too.)

They run a transition layer, and they likely need to run that almost forever; but chances are they won't need to continue to grow that layer , as they continually apply pressure to service providers to offer services via IPv6. Either explicitly as part of business deals, implicitly through direct IPv6 working better than IPv4 Nat, or a mix through weird NAT policies like when they were dropping 'idle' tcp connections after about 10 seconds for a couple weeks.

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