The default tethering speed for current plans is 128 kpbs, far to slow to stream videos.
You can buy bolt-ons for higher tethering speed.
Have you considered "casting" you phone's screen to the device you want to watch on?
T-Mobile will throttle the Hulu video under their "Binge On" policy so that it won't be high-resolution but it will be watchable.
Some devices also allow you to tap off the video with a HDMI adapter and do a hard video connection. One such device is the S9 altho I've read that people have a hard time getting the HDMI video into landscape mode.