I've heard of Kneecap because of the court case.
There really is a lot of the Streisand effect going on here.
I am old enough to remember when "God Save The Queen" was considered unfit for British ears. Pretty much guaranteed that everyone I knew heard it via their older siblings.
Banning things almost always achieves the opposite of the stated intention.
Also there is a fascinating list of "banned by the BBC" that includes (Sir) Paul McCartney ("Give Ireland back to the Irish") and video for "Invisible Sun" by the police. When that was banned I was able to use the library and read a fucktonne more about Ireland than I ever would have at that age. And it pretty much showed me that there was a war going on, whatever it was called.