RC have an internal market that dinamically updates the "price" of each transaction type based on three metrics:
- Transaction size.
- State
- Replay time
Attacking the network with custom json operations will increase the price of them and limit the attack. That would suck for everyone else.
The witnesses can also decline transactions coming from specific accounts with another softfork so an attack would not last for a long time...maybe.
RE: RC Attack Mode: Activated!