Help & troubleshooting for channels on your Roku device, including adding/removing channels, logging in to, authenticating, or activating a channel, channel-specific playback issues, assistance contacting channel publishers to report issues, and adjusting channel-specific settings.
There's been several threads about this issue. I posted a link in one of them that was specific to YouTube support for Roku, but I can't find it at the moment. This link is the general YouTube support site, and there might be a link to Roku specific support within it.
I did the hokey pokey and YouTube works again. thanks for posting the super secret keystrokes from Reddit I appreciate it.
Now someone at Roku needs to get busy and fix it. If that involves reaching out to Google so be it. My relationship's with your device and it should not crash or lock up when a channel does something naughty if indeed they're doing something naughty.
I restarted my Roku and the Youtube app did work when it was the first app fired up. I was able to get into the app and use the Send Feedback option in the Settings menu to send Feedback. And the "help" option in the app also directed me to go to https://www.youtube.com/tv/feedback to report issues/feedback.