If you had 51% of the CPU power within the Bitcoin network, would you a) choose to cheat with a rather high chance of crashing the exchange rate, or b) use the

If you had 51% of the CPU power within the Bitcoin network, would you a) choose to cheat with a rather high chance of crashing the exchange rate, or b) use the CPU power to collect rewards while leaving the exchange rate ”unaffected” with probability = 1? Satoshi considered this scenario. It is also a public ledger, ie even if you don’t mine it is easy to track everything.