I saw a few years ago one group buying spools of fiber just to 'slow down' the trades. As they were submitting them to different datacenters across the country. They wanted everything to show up at the exact same time so no one would front run their trades on different datacenters. They are willing spend millions on HW if it gives them an edge in the market. They would buy bespoke boards that could hold 16x the RAM if it gave them a 50ns edge.