How do you connect to the "cloud" without a network? Wi-fi is LAN, or are you assuming LAN is only ethernet?
i subscribe to optimum as my cable provider. Their optimum wifi hotspots extend into my home, and i suppose if i wanted to, i could forgo a lan, and use their infrastructure instead. I can't forsee myself doing that, but i wouldn't put it past someone who's less technically inclined.
7 years ago, i bought a kindle with a free cellular data plan. Amazon is still paying the freight on books that I purchase from them over that device.