[The following is an abbreviated version of an article that originally appeared in Wireless Watch, a sister publication of Riot. If you are interested in wireless networks and operators, a trial of Wireless Watch is a must.] The imminent death of Sigfox and LoRa at the hands of cellular NB-IoT has been much exaggerated. There are two important points in the favor of unlicensed spectrum solutions for LPWANs (low power wide area networks) – they have an existing market presence, and they enable non-spectrum owners to play in the growing market for digital machine-to-machine (M2M) services, including in smart cities. Delays and dilemmas in NB-IoT commercialization – seen last week in Orange’s decision to defocus on the standard for now…