In the technology world of "data", GTI does not sell broadband with data caps. GTI sells broadband by speed in Mb increments. 

If your internet usage includes checking email, research, streaming on one device, it is likely the 5Mb entry level of broadband is a sustainable plan for your internet use. Should your household include gaming consoles, smart tvs which stream, security camera systems, digital door bell, robotic vacuum, Google Home, Alexa, tablets or iPads, numerous cell phones, digital thermometer and the like, a generous amount of broadband is required for a viable connection to support these products. 

Think of broadband as a highway. Take Rte 109 for example. It's a two line highway. Two vehicles going the same direction cannot travel side by side. Broadband works the same. The more devices added to the home, the more broadband bandwidth is needed to support the activity.