Its that way with many technologies. The lead time on such research is long enough that market factors alter the viability by the time it is ready to get commercialized.
Quite often innovations from prototype technology can be transplanted into existing tech for part of the benefit, without having to build new production capacity. So the new technology does not commercialised, but the learnings from it does.
They need to make (most favoured nation status) illegal. Sellers should be free to set the price they want on any platform. If a seller can offer it cheaper on their own site, or on another platform, they should be allowed to.