Therefore mining with no Shares will be like mining Bitcoin with 10Khs.
So the botnet master will be happily mining even with very low speed?
No Fees
How can you prevent someone issue thousand millions transaction to ddos & destroy the network?
That is correct. Using Big Botnets will kill the coin instantly, their is security step that doesn't allow it. Their will be fees but the fees will be like 1/100 of a Share