People under this project are:

The project uses IPFS protocol which means they are not stored in one place (server)
Know about how bit.tube uses IPFS
They are paid in a token/coin named TUBE. You can then exchange it with BTC in any exchange online!
It doesn't look like you can invest by holding TUBE coins. Only if you want to trade them to make money. Otherwise the only way to make money is by uploading videos and get paid in TUBE coin.