1080p streaming on other services will reach the 1TB cap much quicker. YouTube compression is much more intense than Netflix compression, depending on the show: Netflix picks optimal compression parameters based on the type of show or movie you're watching.

With my tendencies to watch a lot of video content, I myself easily hit over 1.5TB of data consumption each month. Luckily my ISP doesn't do any data caps so I don't have to worry.