>Once they successfully do the attack, they can take over the blockchains and allocate all cryptocurrencies to themselves, cash out, and it'd probably register

>Once they successfully do the attack, they can take over the blockchains and allocate all cryptocurrencies to themselves, cash out, and it'd probably register as a good profit on their income statements. So they're going to manage to not sell any cards (without disclosing that as a public company), set up the infrastructure and do a 51% attack on bitcoin in front of everyone, then "cash out" as if there would be people lined up waiting to buy bitcoin when this has just happened in front of their eyes? Unlikely.