It's not censorship and it's not prohibition.

The Welsh Rugby Union has announced that Delilah will no longer be sung by choirs at the Principality Stadium in Cardiff.

It would be censorship if they were ordering fans not to sing it, and saying anyone singing it would be thrown out. There's nothing stopping the fans from belting out the chorus. I'm guessing the fans probably weren't singing the controversial lines in the second verse anyway.

It's the Welsh Rugby Union's prerogative to choose what material a choir will sing at matches and to ask them to sing something different. Just as it's my choice to pick what songs I want the DJ to play at my wedding. Just as it's a radio station's choice to decide what songs they want to play on their radio station. Just as it's my choice to decide whether or not I want to sing 'Child Owlet' or 'Pretty Polly' at a folk club: if I decide I don't want to sing those songs, it's not 'censorship' it's a choice.