Tor did this without engaging in the ICANN new gTLD program, paying any ICANN application fees, or following any of the rules in the ICANN Applicant Guidebook.
It basically circumvented the entire ICANN process, and it only took six months from asking.
Read MoreThe logic behind the reservation is that if ICANN were to delegate .onion to somebody else (for example, The Onion) there would be a risk that the improved privacy offered by Tor would be compromised.