It will be best if you give your instance or go more detailed when creating a thread.

The difficulty of mining is general, no miner gets less difficulty than another. Using ASIC which is now faster than previous device makes it easier to catch new blocks and earn the rewards before others. To be clear, the difficulty in the network is always the same, since the hash rate increases due to ASIC, the network adjust its difficulty to match the average 10 minutes time of adding or finding new block.

Bitcoin has a fee market, so you can't pay a fixed price to effectively stop legitimate transactions from being confirmed. You can make a million transactions with $1 fee and it won't mean you have bought all transaction space for a day - it would mean that the users who have paid $1 or less will have lower chance of getting their tx confirmed and will suffer some delays, but those who paid higher fees won't be affected. Essentially, trying to DDOS Bitcoin can only increase the transaction costs, not actually deny service, though for some cases, like micropayments that would become uneconomical, that would be a denial of service.