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.
What are you watching that has these ads? Unless it's The Roku Channel, Roku themselves have no control over it. The only way to get ad-free viewing is to have a paid subscription to a provider such as Netflix or Prime Video (and they even have some ad supported content, but most is ad-free).
I agree with @boogernose , for free content you're going to get ads. Depending on the service provider, even paying something might only reduce the ads, not eliminate them completely.
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I guess we all have different tolerances for ads. Several people I know have not watched any ads for decades. Others will put up with anything for "free TV". I'm closer to the former. I used to watch more youtube but even in the past I was annoyed at how long it took many youtube videos to "get to the point". Since ads have gotten more common on youtube, I go there much less. In standard Econ 101 they teach a demand curve of price vs demand, but for me there's a demand curve of ads vs demand too. But as my demand goes down, they are hoping to make more money on the people still willing to watch.