"Mining HNT with Hotspots is done via radio technology, not expensive or wasteful GPUs. … Hotspots work together to form a new global wireless network and undertake ‘Proof-of-Coverage’."
"Tokens & Data Credits: The network uses two units of exchange: HNT, a new cryptocurrency, and Data Credits. Proof-of-Coverage: Our novel proof-of-work algorithm enables Hotspots to be rewarded trustlessly. Helium LongFi: LongFi combines the low-power, long-range LoRaWAN wireless protocol with the Helium Blockchain."
I get the impression is it's to create a cryptocurrency motivation for providing good network coverage. I don't get how it works but assume, like all things involving blockchain, there are externalities or unintended effects that make it not a good solution.