So, what does this map tell us? Where bikes are being used, bikes will be stolen. The higher the proportion of expensive bikes, the more thefts. Unfortunately one of the facts of life, but do we really need a map for that?
I think it also tells us that students use bikes and students insure their bikes (assuming it's claim data. Actually. given we don't know where this data is from I don't think this tells us anything at all).