Compute is now an input cost on the scale of energy, and it is still bought the way enterprise software was bought in 2005: bilaterally, at a price neither side can check, on terms that depend on who you know. Every other input at this scale — power, freight, memory, metals — eventually got a market, because at scale a private price is a tax on everyone who cannot negotiate.
A venue is neutral or it is a dealer. Exascale takes no proprietary position in the instruments it lists: the exchange does not trade against the participants on it. That is the whole purpose, and everything else is downstream of it.