More likely some computer expert bored and making people hunt shadows, that is my guess.
And I don't understant why all the Cicada stfff would help to find Satoshi?
Well, gets me thinking that Cicada 3301 is unlikely to be an individual (far too much "travel" involved).
So, if it is SN trying to "recruit" then, SN has always been a secretive group rather than an individual.
If however, it is an attempt to find SN by a "group" then SN would have that level of expertise likely to solve those riddles...
Who knows...maybe it'll make an interesting film one day ala the davinci code...