TFuel has COMPLETELY exploded. It makes no sense HOW BIG it has gotten.
TFuel is a GAS token for the Theta network. It is earned by watching live streams on Theta.tv by sharing your bandwidth with other viewers. It is also earned by caching streams on the Theta Edge Node, which uses a small portion of your bandwidth while running on a computer.
On May 27th, 2020, the Theta Blockchain and ThetaTV will be getting an upgrade with Mainnet 2.0, which will "revolutionize video streaming", and they probably will do just that.
If you want to invest in TFuel, DO IT NOW. It has gone up 900%+ in the last 30 days, and it isn't stopping anytime soon.