What would happen if someone spammed the network with millions of transactions?
Reminds me of a similar question I'm mesmerizing about:
Who sets the price of transactions? The network or the miners?
If it's the miner, could an entity set up a massive supercomputer, mine most blocks and then set the transaction fees to 99%?
When you send a tx you can add a fee, it's in the options on the newest version. Miners can then put the tx in a block and take the fee, or not, up to them.