This assumes that the reviewer who gave the rating wasn’t considering value as part of their scoring. I’d expect the reviewer to be scoring a TV based on his good it is compared to similarly priced competitors, not comparing to every other TV on the market
The upside of IANA doing it would be a standardised place for sites to move to. Without coordination, different sites would move to different TLDs, probably mostly based on what isn’t already registered. IANA could create a new TLD for this and give existing whatever.io owners a chance to register whatever.iox before its generally available
And they’re not going to pay millions to be the default for a browser that no one uses.