> Anyone with such a large stake can cash out, and then use their former large stake to fabricate an alternative chain in which they did not cash out, forking the blockchain at the block just before they cashed out.
A trade this large is likely to crater the currency before it can be filled in the absence of trade volume so large its practically impossible for one stakeholder to act in the manner you describe.
A trade this large is likely to crater the currency before it can be filled in the absence of trade volume so large its practically impossible for one stakeholder to act in the manner you describe.