Television and radio are advertising media. If the unspecified Federation economic arrangements don't use money, it is unlikely that they use advertising.
So the people of the Federation hear about the planet Risa solely
through word of mouth? Seem unlikely, the place probably gets advertised as heavily as that Atlantis resort is today. If the future Federation has a recognizable economic system, professional entertainment would have to be financed somehow. The same for sporting activities.
In the trailers for the next Star Trek movie, didn't we see advertising on the sides of buildings?