Helium is a "proof-of-coverage" crypto system: "Proof-of-Coverage is a unique work algorithm that uses radio waves to validate Hotspots are providing legitimate wireless coverage."
I know someone they interviewed for a job last year and he said they were cashed up with years of runway but I also know they have a very bad rep in the LoRa equipment vendor space based on conversations although moved on to the LTE CBRS innovation band from what I can tell.
The RF nerd in me thinks it could be interesting but the skeptic makes me wonder how forgeable coverage would be and if the overhead of coverage challenges uses more of the limited spectrum than carrying actual data.
https://raw.githubusercontent.com/helium/denylist/main/denyl...
Helium has been paraded around as a successful use of blockchain when it's highly centralized and has no actual customers.
Visit https://explorer.helium.com/ You can visually see the miners and activity.