I hit data caps somewhat often. Mine is a terabyte a month, I tend to pirate a bit, but I also really enjoying messing around with technology so its not uncommon to spin up half a dozen PCs with different OS a month, Steam transferring data on a local network has been a godsend for games. To avoid it I often download things on my phones data or on a public WiFi like the gym and then SFTP it. If I hit the cap I will call and ask for the fee to waived, threaten to cancel, social engineer and usually get it thrown off the bill