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Last time I checked, there was an AWS dependency, but I believe that's long gone.
As IPv4 exhaustion is now a real thing in North America, some major US ISPs are moving to a (primarily) IPv6 service where IPv4 is "as a service" and by definition slightly degraded compared to v6. If Roku cares that customer experience is going to potentially tank because of that, then IPv6 might be a consideration for the short term... Feel free to reach out if you'd like more info, Roku.
Now it's 2022 with still no IPv6 support. If I thought it was possible for a streaming platform (possibly the biggest) to drag their feet so hard on this, I would not have bought a Roku TV. Every one of the major streaming services supports IPv6. Their apps on the Roku platform are handicapped without it.