I remember in the 90s, my dial-up provider started offering an "unmetered" plan with no per minute charge (for younger people, believe it or not we were once charged by the minute for connecting to the internet). After a short while we were inundated with emails from the ISP complaining that people were "abusing the service" by going on the internet for "hours at a time". Just reminded me of this and how it's an old excuse.
No, you can't "abuse" an unlimited service by using too much, it's unlimited.