What are some Roku private channels that actually work in the US in 2021?

I recently found out after reading a bunch of blogs that you can add a bunch of private channels by entering a code on in your Roku online account and then watch them after you update your device. The problem is, most of the channels on their list don't work in the US. The first one I tried was the Internet Archive, which said something like "this channel has been disabled in your area." The only one that I've been able to work is a hack of Apple podcasts, which is pretty cool but it only streams audio.

Has anyone ever gotten any of the private channels to work and which ones were they?