The Roku Channel hasn't existed since 2014. Same for USACracing.tv. Not since 2014.
All the USAC races past and present can be seen on-demand at
https://loudpedal.tv/.
The season opener for the USAC AMSOIL National Sprint Cars on Feb. 23-24-25 from Ocala, Fla. can be seen LIVE on
https://www.speedshifttv.com/.