If you’re not familiar with it, what a Helium hotspot does is allow compatible IOT devices to share your Internet connection.
I suspect that allowing random third parties to use your Internet connection it’s explicitly forbidden by the terms of service of most ISPs, especially when you are being monetarily compensated/rewarded for such sharing.
Excerpt from ToS: “Customers may not retransmit the Service or make the Service available to anyone outside the premises (i.e. Wi-Fi or other methods of networking).”