Right - the argument here seems totally silly. The cost barrier to entry would be incredibly high. Unlike blockchain systems, the implementation details of mca

Right - the argument here seems totally silly. The cost barrier to entry would be incredibly high. Unlike blockchain systems, the implementation details of mcaptcha are also totally hidden, and you don't have to maintain compatibility at all. Someone creates an asic? Great, you can make it not work anymore without affecting any of your users for real. 10+ million down the drain.