Travel hacking is the mode of gaining free or cheaper travel by earning points and miles through credit card sign-ups and bonuses.
Credit card churning opens up cards, hits the sign-up bonuses, and closes them. People will use credit card churning to earn air miles, travel rewards, or cashback.
With the influx of new applications, you may throw off some red flags, and banks may think you are in financial struggle.
Manufactured spending is spending money to achieve card rewards from credit cards. You have to manufacture enough spending where you are not losing money.