The bits of a cryptocurrency transaction cannot be changed. Its like a signed cheque, can only be read. So since the flag from third party is being used to deci

The bits of a cryptocurrency transaction cannot be changed. Its like a signed cheque, can only be read. So since the flag from third party is being used to decide which transaction is relayed, it is as good as handing over the transactions to the third party to relay them. Majority consensus can still be done by using multiple third-parties.