One of the very few documented cases where a #BGP prefix hijacking is certainly done voluntarily (here, by the #HackingTeam digital weapon dealer company).
▻http://arstechnica.com/security/2015/07/hacking-team-orchestrated-brazen-bgp-hack-to-hijack-ips-it-didnt-own
▻http://www.bgpmon.net/how-hacking-team-helped-italian-special-operations-group-with-bgp-routing-hi