The Big 3 (Samsung, Hynix, Micron) have been playing this game for 30+ years. There used to be many more DRAM companies but most of them went bankrupt when DRAM was cheap because the big 3 will intentionally drive the price down to bankrupt the competition. Now that they have a tri-opoly, they're milking the profits. New competition will emerge but they don't have the capital of the big 3 so they likely won't survive the next DRAM winter.