Why is the FREE STREAMING channel USTVGO blocked by Roku?

How can USTVGO be added to Roku users? Thinking of leaving Roku if they do not open access to USTVGO and going to Amazon Fire Stick, because it does accept this channel.

For many of us interested, USTVGO provides over 85 channels TOTALLY FREE that includes live streaming of ABC, CBS, NBC, PBS and many more ......

Why does ROKU block this channel?