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 are thousands of channel/apps on Roku. I'm not a big fan of ads myself so I rarely watch Roku channels that use them. On the other hand, lots of people like "free TV" so they have that option as well.
Just remember, as has been the case since before the invention of TV: If the product is free, then you are the product.