Can you thumbs down an artist and/or remove them from Radio consideration?

[Rugby (aka Daniel or Big Dan)]

You might try banning

What is the effect in Roon of banning an album?

A banned album or track will never be played as part of a larger unit of playback (artist, radio, “all”, genre, …). You must select it for playback directly in order to hear it. There is no affect on search or other browsing functionality–banning purely relates to playback.