If kidnap/ransom is the play here, and the method and location of ransom delivery is electronic and TMZ, respectively, and bitcoin is the means of payment, then it would seemingly have to be someone incredibly confident - and obviously brash - with their computer skills. And fairly young. Perhaps a disillusioned incel type with an overly grandiose sense of (online) self, obsessed with the sound bite culture and material world, and trolls 4Chan, Reddit, and the like for his "sick burn" dopamine hits.
JMO.