I have a roku but it doesn’t do much on its own. You need to have subscriptions to Netflix or another service to make it useful.
There are a few free channels like NASA TV.
A few free channels? There are hundreds! Check the “Channel Store.”
Also helps if you know how to navigate the unsenet. I bought the PLEX channel and run everything I get off the usenet wirelessly to the TV via ROKU. Surprisingly robust interface for everything on my PC. Not much I can’t get.
You could do the same thing if you have any tech savy friends with lots of video files to pass on.