Lots of debate on this.
Banksy is no idiot, he has been writing graffiti since the early 90’s and obviously had a clue who Robbo was and the importance of the piece. If you look at it the pic above, it had been written over countless times and was fading into the background where eventually it would become insignificant to any buff crew without insider graffiti knowledge. By incorporating Robbo’s piece into his own , Banksy was in fact preserving Robbo’s history since people like to preserve Banksy. Now, what Robbo did in return was pretty great as well. That’s what I got.